A lot depends on how hard they polished it at the factory. Powerhouse Factory Finish polish is a good strong polish. If you don't see any visible sanding lines, the finish is probably already int he neighborhood of 5000 grit, roughly. If you see sanding lines, it could use another dose of polish, BUT you're more than likely NOT going to remove those sanding lines IF you polish it by hand. You must use a spinner to get a good 5000 grit +/- polish.
If you do it by hand, you will probably leave some sanding lines to give you decent length but consderable grip when it does grab the lanes (compared to a fine sanding like 4000 grit).