I took about 120 mcg my first time but just recently my buddies first trip, he ate 2 gummies that is confirmed to be 200 mcg dose ( we get it from a very reliable source) I've only taken shrooms three times since I don't enjoy them as much as lsd so I'm not the best source for a decent shroom dose. Although I would say for lsd I recommend anywhere from 100-200 mcg for your first dose. Although remember that the rule of thumb is that the dose is always lower than advertised so if the person you get it from says it's a 150 tab it's more like 70-150 and if you buy from someone who knows your new to the lsd scene they will trick you by saying it's stronger than it actually is and end up charging you more unless it's a very trustworthy source.
Also the jump from let's say 100 mcg to 200 mcg is more than just twice the effects because the feeling is not linear and it's actually exponential and tolearance builds quickly and goes away fast so to experience the same effect on Monday as you did on Sunday then you will need to take over twice the dose but after two weeks (for the average person) the tolerance is almost completely gone. I don't recommend that you take acid without waiting a minimum of 1 week but the best break would be to wait a month or so between trips.
And please remember to test your lsd or else you can't know for sure it's real acid as it could just be some random research chemical like n-bome's or something that gives a similar high.
And since it can last anywhere between 8 to 12 hours, you should never take lsd around authority figures, teachers, parents, cops, etc.
Golden rule as almost everyone knows is "set and setting" be in a good mood and in a good environment. Lsd is mood enhancer so taking it while happy can give the best feeling in the world but taking it while sad or uncomfortable can amplify your sadness or uncomfortablenes and send you into a "bad trip".
Sorry for writing so much but I love lsd and I want everyone to love it as much as me instead of being afraid of it, like some people I know.
HAPPY TRIPPING