I apply various types of mud and tape to seal the seams and joints of gypsum and cement based wallboard. And more mud on top of that to smooth and level out the surface in preparation for primer and texture. I've sprayed primer and paint with several different airless sprayers, texture with a hopper and a spray rig. I hand apply an assortment of custom textures and faux finishes. I paint with brushes and rollers. I clean and maintenance tools, machines, and equipment needed to get the job done in practical manner. And sometimes I make tools to get the job done or fix some piece of equipment that has to work but tools and parts are days away. Oh and masking, lots and lots of masking, no drywall or painting job can be completed without some masking (or if it's a patch job in a lived in house then it's most of the job).