Don't be fooled by the "cuteness" of the little one. It can still be very powerfull... maybe even moreso than a full-sized adult.
4 grams might be a good starting dose after small amounts have been tested for safety.
Consider powdering your mushrooms together for uniform potentcy, as potentcy is highly variable.
A very high percentage of the A.m.s' active chem. is excreted unchanged in urine, drink up (up to 3 or 4 times) to be blown out of the water by an intense, SUPER-CLEAN experience (not like the sweating, sedating effects of the whole mushroom).
This is not recommended for the newbie psychonaut.
Also, remember A.m. has a reverse-tolerance effect.
Blessings.