If you're going to just knock off the DUST tops, wet sand as per Tod's advise but use a constant supply of water to wash away the 'grit'. I use an old water/garden hose section with the brass end cut off and a slow flow of H2O. It's important to use a flexible 'block' wrapped in your 2000 grit so that you don't end up with 'finger streaks' in your sanding pattern. LIGHT pressure with many strokes is better than too much pressure to just blast through the job and risk sanding through the top layer of clear. Straight metallics are touchy so take your time and it'll look great. The buffing and polishing process will be critical also as you don't want to use too aggressive of cutter compound and break through that clear. Use lots of finer compound instead of less heavier grit, just like in the sanding process. You'd have a ton more latitude if it was a basecoat clearcoat system. Good luck and TAKE YOUR TIME.