No mixing needed
Perlite
Egg crate
Water until it hits the bottom of egg crate
4 tiny holes for ventilation on the upper sides of the tubs
well sealed lid, IE no using crappy $1 tubs.
All this mixing and putting eggs into the substrate was great years ago, and I'm sure many still use it as people hate to change from what works for them, but the substrateless method is just too easy.
I can't see why anyone trying to learn to incubate would want to learn to do it the harder way...