I always found it so easy and honestly quite enjoyable to Tuck.
I take a maxi pad and put it into the crouch of my panty, it being secured by the pads sticky glue. I pull myself WAY Back, Balls to the wall, then pull up my Maxi padded Panties, this will hold me in place. But to be sure I also pull up my Hip & Butt Padded Control Panty Girdle.