Said it before I'm sure I'll say it again. I pretape a lot of my diapers for a perfect fit. You have to know where the tapes go of course, and it helps if your diaper has good "landmarks" on it. Easist way to find the fit is to tape nomally, and then when you find you have a really good fit, shimmy down the diaper and closelylook at it and note the tapes.
Diapers that don't have indicators on them (many medical and most abdl do not) is to go by the pattern on the shell. Don't go by the pattern on the tape panel unless it's consistent from one diaper to the next. (many are not) Taping the tops first is usually easier, as those tapes don't have any angle to them and are usually closer.
As an example, the DC Idyl I put on at night, the top tapes are attached at the top of the tape panel just before it changes into the softer shell plastic, and the tape pull is placed exactly where the white clouds end toward the centerline of the diaper.
The lowers are always a little trickier. On the Idyl, I tape them down about 1.5" below the top tapes, at about a 30 degree angle downward, and so the end of the tape nearest the centerline of the diaper is directly below the "root" of the top tape (back of it where it meets the wing) Of course these positions only work for my exact hip size, on this specific diaper, you have to find what works and then find a way to remember it.
This makes for an absolutely perfect, comfortable fit. Tapes are also at their correct angles so as not to strain one side, plus the tapes are completely flat down with no wrinkles in the tapes or the shell, so my wrists (which usually rest on my thighs as I sleep) don't get jabbed.
I don't usually tape up any in advance, I tape up my evening diaper before pulling it on for bed. But my daytime diapers I often pretape 1 or 2 in advance, so I can change quicker in the morning if I'm running late. It doesn't save much time, but every little bit can help on some mornings.