Never, EVER sand tires down.
The reason why is that when you ride down the road, your tires are rotating so quickly you get an even wear on the tread. if you sand your tires, you can easily wear 1 part down more than the other, or 1 side down more.
This is rarely noticable to the naked eye, but you feel it down the road and occassionaly you'd feel a "bump bump" in turns.
Let the road do the work.
i wear in tires by going through the weave pattern we all learned from msf courses. Some people say "find some gravel and get your rear wheel turnin to wear it down". But the front wheel's still sparkly, and that's mucho harder to deal w/ when it goes out of wack.
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