John Deere Blitz Black

I'm NOT an auto Body tech, just a Carpenter/Drywall Guy/ Painter for 33 years. I'd take it on down flat... kill the orange peel, and start over. Clean it good before you reshoot
It's going to have to get knocked down for sure. the question is whether wet sanding with 400~500 will do the trick or just hit it with some 220~320 in my 5" random orbital till it's flat, then block it with 400~600 and shoot it after degrease and tack cloth?