Rick, my $.02:
Discuss this possibility ahead of time with your wife, girlfriend, relative, or trusted friend. Preferably someone with a cool head. You want someone who can think calmly, because after a shooting
you won't be. Call that person and let them get the legal wheels in motion. Even if the attorney they call only handles civil matters, he or she should know a criminal defense attorney and can make a referral. Any lawyer worth his or her salt should know when an expert in another area of law is needed, just as a good primary care physician knows who to refer you to for a particular medical condition.
If you're in police custody, or in the emergency room, your access to the outside world is going to be limited. You need someone on the outside that can act on your behalf and in your best interests. If you are indicted, you'll have the time to acquire the services of someone like Kevin Reddington.
Your initial legal representation is to prevent you from doing any damage to your case and your defense. That lawyer is like a paramedic. Their job is to prevent further deterioration, stabilize you, and get you to the surgeon.
My wife is aware of what she should do if something like this should happen. Whether or not she follows those directions hinges on how she feels about me at the moment.