Most CCW folks end up with a shoe box of holsters, then two, then three. You are intelligent to carefully research. I have a couple of holsters for the same gun and different types of carry. Two tricks:
1. Moleskin. Anytime a holster digs at you or has an uncomfortable edge on it, apply adhesive moleskin over that area. Also good wrapped to the inside if the gun is a little loose in the holster.
2. Dremel. Can be used to modify, fluff and buff, dehorn, holsters
3. Nothing beats trying the gun in the holster. Most holsters I have that were a waste of time we ordered without tyring the gun first. If you go to Cabelas or anywhere else, bring the firearm in unloaded and tell them at the counter that you have a firearm you want to try for fit in the holsters. This is a good exercise that saves you from buying extra holsters.