There are a lot of "how to spray" videos on you tube. Everyone has their own ideas as to what method is best. You may want to take a look at this video because it shows you how to set up the sprayer, tip recomendations, prime the pump, do the job and then clean is after. I don't know the painter but he explains it well.
This is for a Titan sprayer, there are also video for Graco's . Those are the two most popular in my area.
Zinsser 1-2-3 primer works very well in my opinion. As far as the sprayer goes, it does require some experience and technique, but it can be picked up quickly by most people. Cover well and give it a shot yourself and do watch how to videos on youtube.
Okay getting to the point where I need to either have electrician come or paint the ceiling. What would people recommend knowing I'd have track lighting. Should I paint ceiling first or have electrical done first?