you're right. I sanded the stock paint off (all the way off) without paint stripper, but I would seriously recommend that you DO use paint stripper. Sanding took a LONG time without it and I think mine would have turned out much "cleaner" if I had used paint stripper. Then just spray paint coats from 12-16 inches away from the racquet, allowing each coat to dry (I only did about 7 coats). I think you'll like the results.
P.S. You'll know you've sanded all the way down when you get down to the carbon. Be VERY careful at this stage because you don't want to damage the carbon. Use the finest sandpaper (finest grade, not finest brand lol) you can find.