Yeah Fn button everything that you find important. I did that and I only really have to hit the menu to format my memory card at this point. It'll take a bit to figure out how you want it best, but I think I'm at the point where I'm comfortable with my settings. Since I'm sure you have an A7III you don't have to even worry about figuring out a comfortable way for AF point selection like I did.
I usually kind of have a decent idea at this point, unless I'm going to experiment a little, which usually looks weird for a bit until I settle on a style that's not bombastic and annoying color wise.
I went with the A7RII, I don't care too much for AF select I am too used to focus and recompose and never changed that on my Fuji either, just have to get used to the AF modes in the Sony now since in the fuji 99% of my shots were center focus only, but for the eye focus looks like wide or zone is better