There are different ways of doing it. This is how I do it. I fill a container with about 3-4 cups of water, and add one to two drops of dish detergent (for lubrication). Start with the lowest grit (roughest paper), and put it into the water. Allow it to soak for a few minutes.
Always sand with a something firm under the paper, never your hand. You can use a block of wood, a sanding block, pretty much anything that will evenly apply the paper. I use one of those sanding sponges from Home Depot, cut to size. Sand until your lacquer is level. Wet the paper as needed, to keep it lubricated.
At this point you will want to switch papers to the next grit. Before doing so, it's imperative that you clean your guitar of all sanding residue from the previous grit, and that you change your water. Remember to add the drop(s) of dish detergent.
Continue as above, going through each grit.
You can go through all of the grits in one sitting, or do some sanding, clean the guitar, and continue later. If you split it up, keep track of which grit you're on.
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