It is alot of fun!
I do mushrooms frequently, at least once a month.
I just did some on friday night with my girlfriend, my friend Mitch, and my sister. Mixed with marijuana and Iridium (2C-E), alot of fun, very visual, tons of laughter
If you have never done it before... do not eat more than one eighth. I recommend between 2.5 and 3.5 grams (3.5g = 1/8 oz). Mushrooms vary quite a bit in potency, even in the same batch. 1 g of dried Psilocybe Cubensis (common shrooms) can contain anywhere between 2 and 12 mg of Psilocybin, and between .4 and 5 mg of Psilocin. Psilocybin threshold dosage is about 10 mg, most trips are about 22 mg, and the average potency of mushrooms is about 7 mg of Psilocybin and 1 mg of Psilocin per gram of dried material.
By the way, you will begin to feel them in as little as 10 minutes, but on a full stomach, it can take up to an hour to start to hit. Once you start to feel them, it will be about 30 - 45 minutes before you reach the peak. The peak lasts about 3 - 4 and a half hours, and the come down lasts about an hour and a half. You'll feel still kind of strange for a few hours afterward, but you'll be tired and you'll probably just go to sleep. There is no hang over, or at worst, you might feel sluggish for a few hours after you get up.
Go into it in a good mood. Make sure you are somewhere comfortable and quiet where nothing unusual is going to happen, like for example, do not do it in public, or at a friend's house who has alot of people coming and going. Make sure it is a friendly, comfortable, relaxing environment with no surprises, and try to get some good music. I can recommend Stoner Rock (Sons of Otis, Monster Magnet, Clutch) or Trance (Infected Mushroom, 1200 Micrograms, Astrix), but Rock, Grunge, Metal, Rap, and Techno are good too. Also have an incense with a warm scent, like vanilla, and one with a nature scent, like patchouli. It makes you feel more relaxed and at peace with nature.
Do not do it if you are stressed out, mad, or anxious. that's the main thing that causes a bad trip. Also if you are up-tight and cannot relax... you have to be able to let it do what it does, let go of control, put down your guard, and release inhibition. If you are the type of people who cannot do that, then you should not do shrooms.