Heya Richie. OK for starters, I myself recommend starting out with a clip on holster for practice.
1) at first, practice putting the gun in the holster, THEN put the holster in your pants. IF you carry iwb.
Get a bit used to that, so that you can get used to sliding it into your pants without putting pressure or snags to the trigger area.
Also because with a clip on, it's easier to adjust your clock position and cant for holstering and drawing. I normally didn't use to carry with as much forward cant, as I do now. Partly because of the shorter grip on the sk. But also because holstering with less chance of trigger pressure, for the shape of my body frame.
VERY MUCH practice drawing with finger AWAY from trigger guard.
A lot of dry firing or snap caps. The vp9's trigger travel is shorter than most. So getting used to where the wall is, is a surprise for some. However once you do get used to it, it's awesome!