Remove all knifes out of your place, clean up so nothing bothers you, not more than 1-2 hits, have a strong psyche, do not falter if it gets terrible, have your best music prepared, if you are going to have bad feelings, my experience shows that at least for me dreamy instrumental music in slow pace is way better than usual party music or house or any in that direction, which maybe has to do with the music designed to be "beautiful" instead of fun, once i realize things go bad i usually switch to something like joe hisaishi inochi no namaete & so on, name might not tell you anything and it might be boring music for you, but trust me, chances are good that slow dreamy music will help preventing bad experience, i just had a trip yesterday which went.. very terrifying and was able to somehow control the complications with changing music from rock/pop to something like that, and if you are on lsd chances are good that that kind of music will be just amazing to listen to, well at least if you get a good hit.
I recommend you taking 2 hits, simply because most hits are like 50mikrograms, which is nothing, in the 60tys 1 hit was 300, ok, today most people are scared of everything above 150, and it sure can be scary, but you have to ask yourself first if you want to experience LSD how it was originally taken, or how it is taken today in party scene. There is an gigantic difference between hippy era LSD dosage/ dosage of psychonauts and people who just want to have some fun time dancing and so on.
I myself always recommend never to start with half a ticket, a lot of people will disagree because it can be dangerous, but then again, in the 60tys people started with 150-300 mikrogram tickets (which also had to do with lsd beeing like 1 dollar / ticket back then).
I can also recommend you colour, it greatly improves the fun with visuals, like having a keyboard with green backlight alone can be very stimulating, if you have a friend sitting you, then maybe 1-2 torches, if alone refrain from torches.
Tripsitter:
Tripsitter are problematic, 9/10 people might tell you to never trip alone, and its true, if you have a complicated trip, you will think something : i do need help, i will die, i will this/that, and you might run out on the street terrified, well that usually only happens to people that do not know what the hell they are doing, or lost reality completely, which is with 2 hits not really to expect, moreover while your best friend with lots of LSD experience, that you do not have, could maybe help you during such an experience and calm you down, the usual friend without lsd experience will just panick himself, or do the completely wrong things.
Moreover if they have no experience with sitting LSD, they might make it even way worse, i had a trip sitter once, and he was about to call ambulance and stuff, thank god a friend could pursuade him not to do so (he was calling around asking evry kind of idiot for help because he had no idea what to do, and he did receive instructions from me, pages of information of what to do, did he read it ? maybe, did he use it? no.
You might have heard of people ending in the asylum after LSD, well, thats not entirely wrong, however not evryone got "mad" because the LSD, but because they were transferred there by worried friends and parents during the trip, which probably instilled incredible fear and terror into them, moreover the moment they got you there, or take you there, they give you all kinds of sedatives, which is also bad because it stops the experience and makes you unable to finish the problems you are facing, which can lead to you having to fight with them long after the trip, e.g.
Again, most people will tell you to have a tripsitter, but it really can be more dangerous than having none, and i tell you that as someone who trips once evry or evry second week for long time.
If you however really intend to trip outside, having a tripsitter is better, but even better would be having an experience friend you experience it together with, since if you are on LSD hanging out with sober people isnt always that cool, if they have no idea of LSD.
Dosage: Like i said, take 2 Hits, except the source you got it from tells you that the hits are very strong, but even if you get 100 mikrogram hits or 150, it wont kill you, it will just be very overwhelming, but if you really want lsd, thats what you want, since thats how LSD was originally used by hoffman & co, dont make yourself a headache because of what could happen wrong, and remember that even if you feel bad during the trip or are totally scared, after the trip you will better as before the trip, just embrace the trip and dont fight it, i just had very complicated trip yesterday, and i was like having completely mental breakdown, and today i feel better than i did for a long time, because i let the complicated trip happen and am cleansed.
Taking 1 hit obviously reduces the chance of having complicated trips, however those experiences are part of it and there is nobody who uses frequently who never had a complicated (often called "bad") experience with lsd, at least none i know of, however even if those things happen, the tradeoff of having a beautiful trip on higher doses is worth it, since while on 50 mikrogram you just think everything is beautiful and nice, you will think everything is just incredible beautiful and amazing on 100mikrogram.
So yes, take 2, if you tell me the date & time of your trip, i might even be able to give you my number in case something really happens and you need mental help.
Place to Trip:
You said it yourself, nature, - well thats obviously amazing, but please, please be away from people, one reason LSD is forbidden is because there were issues with LSD taken in public, and if you are on LSD in an area where you can encounter just one stranger, it can cause the trip to become really really strange/bad.
Tripping alone on lsd in forrests can be difficult, since you get way easier scared alone if you are unexperienced, especially if it is night, it can just terrify you to death and you will get something like blairwitch project.
When i trip in the outside, i like to do it with hipsters and hippys. And if the trip gets terrifying, you are two people, which helps a lot.
But since you do not have any friend who has LSD experience, thats out of the question for you, which is why i would say you should refrain of going outside on your first trip. Wait 2-3 trips. You could of course just take 1 hit and experience outside quite easily doing that, but then again, im not advocate of starting things on low dosages, because it can end quite bad as well, because you can greatly underestimate the substance and if you get a strong ticket afterwards, get blown away.
I hope i could help.