Help with wet sanding

So I have wet sanded several times with great results when it comes to removing scrathes, RIDS etc. However I have a car to play with that has loads of orange peel after a crappy Macco repaint. I have started to do some sanding and was wondering a few things

1. Wet sanding small scratches by hand is no problem, but it will take forever to go over this whole vehicle. What do you guys use to speed up the process? DA sander, palm sander?

2. What wet sanding paper do you prefer? I've been using 3m stuff from Lowes with pretty good results.

3. What steps would you use? 1500, 2000, 2500, 3000 or 1500, 2500, 3000?

Thanks in advance for any info and I appreciate any other tips you all might have.

It's really hard to capture on this color, but the left side is untouched and the right side is done 1500, 2000, 2500 then SIP via yellow pad on PC.

 

you can see a bit of difference in the reflection. maybe try using and independent lightsource to show it up some more.

 

I tried with my halogens, but it ended up being harder to see the difference. In person it is dramatic, but the camera just doesn't want to pick it up.