The biggest mistake,,,
,,,is to use the "Swine Theorum" which states: "If a little is good then a lot must be better."
If you have one of the molded holsters than using a softener will "erase" some of the molding. The wax treatments work well on those holsters.
Whatever you use,,, use only a little of it.
Neatsfoot oil (pure, not the compound) is not the evil stuff most think it is,,,
It's that most people drown their leather in it.
A tiny amount keeps the leather fibers lubricated so the leather does not crack,,,
But this is a once a year thing.
Renaissance wax is great stuff,,,
but like all waxes it can build up over time,,,
Again, this is because most people simply use too much.
Wipe your holster with a slightly damp sponge using water and saddle soap,,,
After it dries you can wax it with a TINY amount of wax,,,
Once or twice a year is plenty.
But again,,,
Use anything sparingly.
Aarond