KNOW YOUR WEAPON!!!
A carry or personal defense gun must be an extension of you. You must know how it works, and everything it does. There is no such thing as a personal defense gun or carry gun that is in 95% or better condition. They need to be used, practiced, tested to the point that they show wear.
All this is to say that even tho you may find yourself getting a burn from a revolver or cut by the slide of a semi-auto, any injuries will be due to the extreme dictates of the situation you are in. However, you will have practiced enough to know how to handle the gun in most situations in a way that you will not injure yourself with it (see this past weeks episode of TBD and handling a handgun in a car so as to not shoot yourself in the leg or disable the gun on steering wheels).