Originally Posted by
Simon Barden
I'd disagree here and I'd sand a bit now as you know you'll probably need to do some sanding later. You want the finish on the body to just go over the edge into the pocket (just by 1-2mm) to help stop the finish chipping off the top of the body. If you have to sand back the pocket so much that you remove all the finish from the edges of the pocket, then the finish will be more prone to chipping around the edges of the pocket when taking the neck off and putting it back on again. It may not chip, but having the finish stop on the edge of the pocket does make chipping more likely.