Before I opened my golf shop I spent 25 years at the DuPont company as a class a painter. It took years to get to class a. Then when they decided to go to contract painters they where bringing in guys that looked like they where throwing it on the walls with buckets, half drunk much less. I can paint a room in a tuxedo and not get a drop on me. It’s a patience game. When you feel a little tired take a break and come back a little later. Carry a damp rag and keep your hands clean, if you take a break put a zip lock bag over your brush or roller to save constantly washing it, when you open a can of paint get a small nail and put a few holes around the rim of the can. The excess paint will drip back in the can and not down the sides. Buy decent brushes, synthetic for latex and natural for oil base. Just a few tips.