I didnt have even a 1/16 of shrooms the first time, and it was awesome, then i gradually worked up to over an eighter. I think it is good not to jump into hallucinagenics too fast, a 1/16 is good for first time. The advice i strongly advise is HAVE A SITTER. Your friend who is taking the other half doesnt count. Make sure there is someone who is SOBER to help you out if things go south. You can do some stupid shit on mushrooms.