Are you sanding by hand, or using a sander?
If you're not using a sander, go get one. It makes it so much easier/faster/nicer.
I bought a palm sander from someone on the forums a while back, I believe it was Zet. It works nais, and the things I've sanded, even with a ~300 grit sand paper came out pretty nice. Of course, I also have a 1000 grit that I like to work my way up to and finish on.