i did it my second time shrooming (7 grams). i was a junior in high school. i ended up puking and not really being able to move. so i just layed there and tripped balls with my puke not too far from me lol. walls were moving towards me and away. room was fully melted. very red tint overall. i was super fucked up. just be careful man. it could be a good time or a really bad time. not saying this will happen to you, just be careful. i was fine after 3-4 hours, just the peak was super intense.
maybe eat 4 grams, see where your at, then an hour or two after your initial peak then eat the next three grams. just a thought. but then again you should just eat all 7 grams, you never know how it will turn out.