What types of presses?
If im trying to press on like the top of something i just try to keep my skis straight and either lean forward or back depending on if its a nose or tail press.
For butters(i only do butter 3's or higher, normal or switch.) I like to either hop 180 onto my tips and lean forward as fuck, or kinda spin and lean forward so that i do a longer sidewaysish nosepress before i get to the apex of it. For switch butters i kinda just get into like a wall sit position so that my tips lift and press it out while spinning.
For rails its the same as stalling.^^ The most key detail is keeping your skis straight. you dont want to be pretzeling with weight on your tips or tails. Itll do ya dirt.
Ive got plenty of presses in that vid^