I used to tape for almost a week, and have since just tuck without a gaff or tape or anything; like Arianna said, I just try to use tight-fitting clothes(but they feel much looser now)
When I did tape, I used the 2" kind, also also the .5" ones, basically taping the 'lips' shut and then using the 2" to tape behind...but I could never figure out a good way to tape behind. Straight down my butt? Or just on one cheek? I wasn't very successful with tucking, and it really irritated my skin.
I saw this one video that uses a similar 'lips' method, but then they use one of thoe 3"x4" clear tegaderm patches and I think that would really end up working the best, if I ever were to use tape/adhesive again. That would be a rather expensive route to take, though.