General

Tips for new feedee/gainer

A test gain yes just to see what you think is a good plan.
2 years

Tips for new feedee/gainer

Pretty much what Ditzy said. I think you're in a good position to give it a shot. Just pace yourself at meals, make sure you don't go stuffing yourself to absolute bursting, otherwise you can get sick and throw it up, or if you do it too often, you can burn yourself out on the idea.

If your grandma is the type that loves cooking or keeps offering snacks, absolutely take advantage of that. People think of large meal stuffings, but you'd be amazed how much weight you can gain with constant snacking.

Good luck!
2 years