i guess everyone is different and some people can do mushrooms by themselves but i personally wouldn't recommend it. i'd say do like 1-2 hits of decent acid. make sure you have a short list of some fun things you might want to do and have a nice little playlist of songs. pink floyd is amazing. also check into some trance music like enigma..really cool. personally i was never able to handle doing mushrooms by myself. acid i have almost always done alone. 5 hits...6 hits...i was good. it's alot nicer for self exploration and meditation. make sure you're in a comfortable spot and that there is nothing around that might put you in a bad trip. everything is based on set and setting.
my first acid trip i just chilled in my room all night, played some flyod and dead and just chilled back and learned alot about myself if that makes any sence