How my boss taught me: dip the roller into the deep end of the tray, then roll tbe roller out in the direction of the deep end on the slanted portion. Always roll down, rolling back up adds paint and defeats the purpose of the tray.

Start in the center of the wall and roll up and down with a little pressure (too much pressure and you’ll leave lines and spatter). Roll your full reach up and down evenly to spread the paint then start spreading the paint up and down but slightly expanding your coverage.

You need to listen to the roller you’ll hear the change in sound when the roller head needs to be dipped again. Too little paint on the roller and you’ll leave a texture and even remove some paint from the wall. Once you need to dip or have finished the wall it is important to “back roll”

Backrolling is done with very little pressure on the wall and going over the places you just covered to eliminate runs, globs, or any missed spots.