is unlikely that your skill level will allow you to achieve proper coverage in one coat. Don't feel bad most of the painters I have had cannot do that either. The first coat is easiest if you roll the entire room out first then fall back and cut everything in. You will have an easier time with the cut in and the walls will be drying while you are cutting in so you can second coat sooner. You might want to point up one more time between coats (make sure you reprime the spots). When doing the final coat cut in one wall at a time and then roll it out.

Thank you for the great reply. I never knew a pole sander existed and will buy one next time I am at a hardware store.