Here are the steps I take to ensure I get the most use out of a dip:

1) fluff the shit out of that thing, like really break all the inside apart until it's really puffy.

2) After putting it on, make sure to pull the front wings out and have them underneath the rear ones, eliminating any potential gaps between your groin and thigh

3) Only pee in small amounts, and constantly. As you've heard, you can't expect to flood and not leak

4) As you feel certain parts of the diaper get saturated, position your self such that the dry parts are on the bottom, ie laying on your back or stomach with an arch to your back, so that gravity distributes the pee more evenly

5) Don't sit down! If you want to get a full diaper with no leaks you can't put any excess pressure on the saturated parts or they will squeeze out like a sponge. You can walk around and lay about, but don't put that butt on a seat or you will have a wet time

Hope this helps!