Russell, you already got past the toughest hurdle in this situation ... your boss. I've learned a lot on TFL (etc.), and I'll try to pass a little on (many others here will provide more experienced advice):
1. First, use the 'Search' feature of TFL to research the finer points of this decision (type of sidearm, training, gear, ammunition, etc.)
2. A sidearm will probably be best. Try before you buy ... firearms can be rented at Caswell's in Mesa (nice folks), Shooters World in Phoenix, etc. As far as caliber, don't go smaller than 9mm. If you can afford more than one sidearm, then buy a full size now (for open carry), and perhaps a smaller sidearm later for more discreet, concealed carry. [Using the same caliber for the two can be handy.]
3. Take the concealed carry course, even if you're too young to get the permit. Good training - pay special attention to the color-coded awareness concept (especially considering your occupation - watch your 'six'). Caswell's is a good source for training, and they have a FATS machine (simulator ... this will quickly convince you of the seriousness of self defense). Then, join a range and practice.
4. Buy a good quality flashlight, like SureFire, and always carry it. Also, buy some pepper spray - it is good to have more than one form of self defense so that you have options. Lethal force is your last option. I've never been there, but I'm convinced .... if you ever have to use lethal force on someone, you'll likely experience long-lasting psychological and financial repercussions.
5. Read. Read TFL, and ask questions. Read books on using firearms for self defense - 'Stressfire' by Ayoob comes to mind. There are many others.
6. Kind of a bizarre thought, but consider a 'ride-a-long' with LEO's in your work area, around the same time you'll be working at night. Police officers are human beings, and if you can establish a relationship with a few of them, they can become your late night friends. And, if you ever need help in the middle of the night, it doesn't hurt to have a few friends around. Besides, they can fill you in on the risks and risk areas. Just a thought.
Recognize that you're crossing a philosophical 'bridge' ... from complacency and raw hope, to awareness and preparedness. This is a significant journey. You have simply decided to buy 'insurance' by using 'safety rescue tools' as part of your 'risk management'. Many people never cross that bridge, or even know of it.
Take care out there. And, take this responsibility very seriously. Join with us as a responsible firearm owner, and help preserve your individual, and our collective freedom.
Regards from AZ
(ps - noted the above post coincident with mine. I forget the age rules, and those may be an issue anyway. Get the Arizona Gun Owners Guide ...
www.gunlaws.com )
[This message has been edited by Jeff Thomas (edited May 25, 2000).]