for something like penis envy( psilocybe cubenesis) I would recokon 2-5 grams, if you can get some psil semilanceata it would probably be similar but its a darker experience in all ways so I would not go near 5grams on those.
Golden teachers I would definitely say at least 3gs.
GT is what I have.
I have done this before, and each experience was pretty great, but it's been probably 20 years.
Funny thing is, forgot I had these, they are vaccum sealed and a year old, so not sure if potency will drop.