Be very careful and consider the results you will get if you use a paint and primer in one step. I have seen a lot of ads pushing this idea of one-coat painting, but that just plays to people’s idea that painting is a drag and one coat would be quick and easy. It is not messy and it is not hard to clean up.
Lazy? Soak baby. The best way to clean a paint brush start simply by soaking it. We find a bath tub if there is no utility sink and we routinely put off cleaning for the night and let the brush soak in the bucket. The next day it is so easy to clean as over night the floating brush and roller lets the paint falls to the bottom of the bucket.
How to Paint a Wall? Let me count the ways. Ok, here is the short version: you will see all over the internet all these people telling you how to use tape, and how to clean the walls, brush first, etc etc. Well, they clearly read the manual written by someone who read a manual, but in practice, you just jump in. It’s just not brain surgery.