I'll start by saying I've done mushrooms 4 times, and each have been enjoyable. The first time I did them I took 1.7 g with 2 of my friends (they took the same amount), and 1 of them had a great time. The other one after about an hour started saying he was feeling sick, and retreated into his bedroom for the evening. I tried to go up and get him to come down, but he wasn't having it. Once I eventually got him to come down, he wouldn't leave the couch until he stopped tripping. I had a great time though, some decent wall breathing and crazy emotional feelings.
the second time I took them with 2 more friends (1.7g), and the exact same thing happened. it was dead winter, and I was dying to go for a walk and check out the snow outside, but my one friend refused to leave the couch, and I wasn't going to leave him there alone tripping.
the third time I went to go see addison groove project (1.7g), and ate em on the way there. Once I got into the venue I was tripping sack. My pupils were monstrous, and I heard people whispering "yo check out this kid" (they really were saying it, I wasn't imagining that). The music was amazing, and I had an awesome time.... again.
the 4th time, I took 4.0 g in illinois at a music festival. My buddy had just taken 2 tabs of acid, and it was his first time tripping. He started freaking out and saying that he was going insane, and would never go back to normal. Despite this, I still enjoyed what I was feeling on the mushrooms, even though it was obviously inhibited by my friends anxiety.
If this is your first time, I would suggest eating 1.7 g (which is a half eight) with some kids that you smoke with regularly (assuming you smoke). I loved looking at glass piece when I was tripping, and oranges tasted really good. Koosh balls are fun too, they feel weird. good luck man, hopefully you'll have fun.