First off all, ask your friend how many he took and how his trip was. Sometimes one mushroom is enough, sometimes u need 4-5. Don't take them all at the same time, it might take about an hour until you feel something so you better start slow and throw some more in if needed.
Don't do it at a party or something, people on mushrooms tend to get stressed so you better stay in a sourrounding where you know what's up, no surprises you know. That could be at home with a friend or something, I wouldn't recomand you to go to a club or something esp. not if you take them the first time and have no idea how u might react.
Noone can tell you how your trip is going to be cause it just depens on the mushroom as well as on the person.
Well, on a sidenote, most people dislike the way mushrooms taste, don't get scared.
Any more questions?