OK, not knowing why you need three guns. Really, Texas is not as bad as you think.
First of all, you'll need to take training classes on the workings (how to draw, how to shoot, how to clean, etc.) of your gun. After you have mastered this with about 2,000 rounds per gun, then you'll both need to take tactical training (using cover/concealment, situational awareness, etc.). After shooting maybe 5,000 rounds here, you'll be ready for self-defense carry. By this time, you'll know what you, your gun and your ammo can do and won't do.
Good luck!
Jeff