what do you have to do to remove inside panel on sliding cargo door handle

The best thing to do here is either purchase a repair manual or take it to an 'auto glass shop' if you have one near by, they have pulled more door panels than anyone else around has you can bet on that. It's very difficult to explain over the net to make it clear as to what you need to do. It is usually a pretty straight foward repair, look at it to see what needs to be removed. Screws, clips and other items attached.