+1 on no air in the tire while installing it on the rim. I got in the habit of taking fresh tubulars out and airing them up off of the rims, to about 125-140 psi and letting it sit for a few days, the repeating the process 2-3 more times with single days sitting. Then I will work the tire, sans adhesive, on to the rim and allow it to stretch, using 100 psi +/--. Other than these personal habits, Repechage and Salmandrine have it summed up very well. It takes patience, and I had to develop some when I began riding tubs, back in 1979.
Bill