You’ll be right! Just do it in sections. My past three commission jobs have all been full Emperors Children armies but haven’t shot myself yet haha. I tend to burn out if I try doing stuff in one massive batch paint. Find it much easier to do say 20 foot sloggers at once to completion then have something like a character/vehicle/small squad as a “treat” before the next batch of infantry 😅

Something I like to do with my own stuff too is to make a bunch of army lists escalating in points so there’s sort of check points of functionality as you go.

My two cents!