How to paint inside of house?

Paint and a roller works best on my opinion. Just do all your taping up first and paint the surrounds for.

Actually, taping up is a pia. You paint a stripe at the top of the wall, then use the roller to paint down to just above the baseboard, and then use the brush.. I work in 2 ft sections down the wall, and repeat the 2 ft sections to keep a wet edge.

Paint rollers and brush. Start with ceiling , walls then trim work. Latex for walls and ceiling, oil for woodwork.

Here are some fantastic sites with step by step instructions. It is a big job. Goes quicker if the house is empty. My house needs painting badly and I am dreading it as I have wall to wall and floor to ceiling furniture that is extremely heavy and not easy to move. Hopefully your situation is better.

https://www.diynetwork.com/how-to/skills-and-know-how/painting/10-things-you-must-know-about-interior-painting-pictures

https://m.wikihow.com/Paint-the-Interior-of-a-House

https://www.familyhandyman.com/painting/techniques/10-interior-house-painting-tips-painting-techniques-for-the-perfect-paint-job/

https://www.sherwin-williams.com/homeowners/how-to/painting/interior-painting-how-tos