Ya definitely don't get scared by the comments. Everyone that has done psychedelics more than a couple times has had great experiences and a few bad ones. Believe me if you go into the trip positive looking forward to a good time you will have a great time! And shrooms are definitely something everyone has to do at least once.
The only thing you have to remember is that the mindstate you are in during your trip is set for the most part at the beginning of the trip. So if you are in a good mood at the beginning of the trip you will have a great trip!
Just forget all this stuff you read in here, eat em with someone you are close to, and have a great time.