The best thing to do is get out there with your gear. You'll figure out what works and what doesn't quick.
I have a fair bit of "simulated" use, but I've just been wearing it without any real thought of placement. Here it is a couple years ago, just changed the placement of a few pouches and traded out the SERPA for a Safariland 6004. I haven't used it in over a year, though, so it's time for some adjustments.