I do basically the same thing as Bill. However, when I check wing incedence I check it just out side of the ailerons towards the tips. My thinking is that the incedence out towards the tips, will have a greater effect on how the plane flies than it will towards the fuze.

I also check both sides, and if there is a slight discrepancy from side to side, I split the difference. Typically it will be less than 1degree from side to side.

I use a bubble level as does bill. It can be tricky with the airfoil, but I mark off a small area towards the center of the V-tail with ballpoint pen, and am carefull that I do not sand in that area while I am sanding the airfoil on the tail.

If you are a little carefull, you can avoid sanding this area much.