Yes, and you don't necessarily need to sand them much. Use some 220 grit sandpaper (and a power sander if you have one, it's much faster) to sand them just until there is no sheen. Then prime them with a good primer. I like Kilz "premium" or the Pittsburgh Paint equivalent for primer and I'm also a huge fan of Sherwin Williams paints.
Oh, and when I did my cabinets, I had a lot of trouble with those white foam rollers - they just pushed the paint around and I hated them so I ended up using a low nape roller and they came out great. Good luck!
I painted my cabinets that were pressed wood with a layer of that fake cherry on top. We sanded real good and used Gator Gripper to give it some "grab". I would also advise you use a high quality paint. I used Sher. Williams proclassic acrylic semigloss enamel. I have a 36 handle kitchen and only used half a gallon. Its a thick, almost vinyly paint. Very pleased with it. Roll with small foam roller. That paint I mentioned is expensive and worth every penny. It still looks the same ten months later. No peel or problems.
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