I use a long small screwdriver through the window and twist it back and forth under the tab. That starts the bending of the tab without needing to pry straight up. Once you get it bent a little, you can turn the screwdriver with the head perpendicular to the tab and then push gently. I recommend heating and annealing the tabs too, if you can reach them. I broke a few tabs on old STD gauge before I learned this.
For painting, it's best to hang the parts and paint both sides at once. Otherwise, the overspray ruins the finish. I have a very large box that I use for a paint booth. Drop a hanger through the top, then you can turn it to get both sides. I prefer drying in a lightbulb oven for an hour then let the parts dry another two days before assembly. (That's with Rustoleum paint which takes forever to dry.) Also, wear a mask or scarf while painting. I failed to do that a few times and was wiping paint out of my nose for a few days. That can't be good for you!
George
