That's moving along nicely!
Since you don't have a color coat on there and you have 10 heavy coats of lacquer, you can afford to be a little more aggressive while level sanding. That surface looks pretty uneven, even though you're not trying to accentuate the finish with those pictures.
When you sand, you need to get it level before you put on the next coat(s). That means you need to sand with something flat, so you only hit the high points. Best thing is a common rubber sanding block, such as this...
They're usually about $6-$7. You need that because if you try sanding by hand, the paper will follow the surface, and best case is you'll follow the flaws and not accomplish much other than removing the entirety of the finish rather than just the high spots. Worst case is you make the surface wavy. You won't see it while sanding, but by the time you get to polishing, it'll be very obvious. Also, be sure and get the hard rubber version of that block; they make a hard plastic one that's not suitable for this kind of work. It's designed more for flattening small drywall repairs.
Blocking it gets rid of the high spots created by the "orange peel" effect spraying sometimes creates, or brush strokes from brushing on a finish.
When you're sanding with the block or a D/A, things will start to look like this...
The white spots are the low points. If you have a brushed finish, you'll see lines instead of spots. When you wipe the sanding dust off with some naphtha, you'll see where the depressions still shine, while the high points are dull, like this...
Another shot of the same thing...
This one shows the difference between halfway there and completely level
When blocking, you want to get to where the surface is uniformly dull. I use 320 grit, but that's just me. I like to go slower. Some guys use 220, which is probably fine enough. Of course, around the edges of the body where it's rounded over, you'll need to do that by hand, but be calm and smooth about it. The pressure you apply gets amplified by the smaller contact area, so it's very easy to take too much off.
Once you're happy with how much finish you have on there, you start doing the same thing, but with progressively finer grits of paper. Something along the lines of a 600/800/1000/1200/1500/2000 progression, then you can start with the buffing compounds, and finally a polish.
Nobody will believe you did the finish yourself.
