Get a trip sitter and don't drive anywhere. Also, bear in mind that like with marijuana some shrooms are stronger than others, even if they come from the same dealer sometimes. Personally, I have been taking 3.5g of strong, dried magic mushrooms the last two times I tripped off them and, frankly, would rather take a whole quarter next time, except the price is if not prohibitive at least on the expensive side for a single experience. Also, take the whole amount that you are planning to take at once; don't stagger your doses. This is of upmost importance with LSD. I'm not sure about shrooms but better safe than sorry. Yes, the last and only time I've ever taken 7g of shrooms, I freaked out, but I mainly attribute that to the (stupid) fact that I was driving by myself at night in a large, somewhat unfamiliar city and was, at one point, lost. Besides, freaking out a little is to be expected in small amounts for any trip which pushes the dosage envelope a bit, and in my opinion, most of those types of trips end up being the most valuable. The other thing that disappointed me with my re-acquaintance with psychedelic fungi was that the whole experience was not nearly as deep or profound as LSD is, which I have taken a lot more of than shrooms, and didn't engender any deep insights--spiritual, relational, personal, or otherwise--that I associate with a good trip. Then again, neither did my experience vaping DMT, although it was awesome in other ways. The lights were definitely brighter and the colors prettier, however.