Very carefully going through the fuselage and making sure everything is match drilled and fits correctly before I start taking everything apart. Marking everything that gets dimpled, marking overlaps to be primed, and marking edges I want to roll to make sure everything fits tight. Trying to make sure I know what gets countersunk versus dimpled. I started to think about getting creative and countersinking where there are multiple skins overlapping but after doing some reading it appears that dimpling everything I can is the right answer.