i always tend to advise people when taking them to be open for anything. honest introspection. and love thy neighbour. Keep an open mind and you will have a wonderful time i'm sure.
There's a lot less visual but a lot more thought manipulation that goes on. It can go both ways. There's no reason to be afraid if you can control thought/fears and let things slide.
For me, after 10+ grams my thoughts tend to go faster than i can understand them. Then i just move on to complete silence and ignore all the thoughts that pop inside my head seemingly without my control.
absolutely loved my first time, i took 15g truffels and had a wonderful, powerful experience. it was a little rough in the beginnings but when i relaxed.. boy did i relax

hope you or your friend will have a good time as well!