What steps do I do in order to paint my pine walls with acrylic paint.

https://www.todayshomeowner.com/how-to-paint-knotty-pine/

Hi Keith. Everyone is going to tell you to sand them and blah blah blah. I used to be a decorative painter. Run, don't walk, to Home Depot. They sell a primer called GRIPPER. It's nothing like other primers. I've done this project before. Get a couple paint brushes (3" and 2") and a roller with 1/2 nap. If you have paneling, you just need one brush. Roll the gripper on, and make sure there are no drips. The important thing is to LET IT THOROUGHLY DRY. This stuff sticks to anything, including melamine. It is washable but if it gets on your hands, it likes to stay on your hands. I'd wait until the next day to put on your new finish coat. NEVER EVER EVER EVER sand this stuff. It'll make a ginormous mess. I repeat. NEVER sand it. So make sure there are no runs, drips or errors when you are putting it on. If there are drips, wipe them with the brushes and keep going. You don't need to be perfect with this stuff either. Don't glob it on. And it's not necessary for the pine walls to be completely white. Gripper seals and adheres. It won't come off the walls and make s a great base for your new color. Good luck!

Here is an article that might be helpful - https://www.todayshomeowner.com/how-to-paint-knotty-pine/ - good luck

Lightly sand to remove any gloss and roughen the surface for paint. Prime with a good stain blocking primer like Zinsser 123, BIN, or Kilz. Then paint with your color. Prep is the key.