If you've never done mushrooms or a pychedelic before, I would advise against such a large dose. I understand what Paul did, but I think he is the exception rather than the rule. I've done multiple high doses of pychedelics, including high doses of mushrooms, and I still stutter. I think these experiences really did help me with my stuttering though. In short, start with 2 grams of so for a first timer. You can always do more in the future.