Holster too tight?
Just like a new pair of boots or when you got a new ball glove when you were a kid, your new holster needs to be broke in as well. It's better if your holster is tight for retention purposes.
If it's so tight that you cant pull your gun out, we suggest that you put your gun into a plastic zip lock bag and let it sit over night. Believe it or not the thickness of the plastic bag stretches the leather enough for a better draw. The plastic serves another purpose. If you put your gun in the bag and slide it in and out of the holster several times, it will actually lubricate the inside of the holster.