It really isn't like a baseball glove. The only thing you want to do is put your gun in it and carry it. You do not want to put any thing on that holster that would cause the leather fibers to breakdown and become soft.
If the gun is too tight in the holster, put the gun in it and leave it for 24 hours or so. That should loosen it up enough. Otherwise you are good to go.
"He who laughs last, laughs dead." Homer Simpson