Or you could be like me and become deadly serious and philosophical with no will (or ability) to laugh. Be prepared for all possibilities.
Im the same exact way. Mushrooms are a very serious drug to me and usually way more spiritual than recreational. I find LSD and mescaline more recreational.
Basically, the come up varies for me. I either feel a very ecstasy like feeling where I just feel that everything is meant to be and of great importance or I get a really anxious and fearful feeling.
Once you start trip everything seems to look cartoonish, I find Waking Life and A Scanner Darkly to look exactly like a mushroom trip. You'll see shit morph and melt and you'll probably see eyes all over the place. When you close your eyes you'll be put into a trance with amazing visuals where you pretty much forget that you are alive. All of your friends and your life in general will seem like faint memories. If you listened to music before you tripped you'll probably think you're hearing the songs even when you are not. When you are listening to music it will basically go with the trip and sound completely unfamiliar. Expect minutes to seem like hours, especially when you are in one of those trances. I feel mushrooms alter time more than anything besides DMT and maybe salvia. Also, i know some people dont believe they really happen, but time-loops do occur and they are fucking weird. I also feel connected to people that have taken mushrooms in the past like native americans and such, its a really weird feeling and completely impossible to explain.
Bad trips suck though, and I really have no advice. People always say just to let go and to go with the flow, but when you're having a real bad trip thats just fucking impossible. If anyone has seen Requiem For a Dream, Im guessing my mind has associated that song during the ECT, jail, and double-dildo seen to bad drug experiences because whenever i have a bad trip that just plays non stop. The feeling of fear you get though, is just not comparable to any feeling you've ever felt before. Its stronger than any euphoria (ecstasy, heroin, anything) ive ever felt.
Preparation wise though, hope for the best but expect the worst.
EDIT: Mushrooms taste like unsalty sunflower seeds, i hate sunflower seeds so usually i have a hard time eating them alone but peanut butter and jelly sandwiches completely mask the taste and texture.