1. Have a gun.
2. Use your gun, even if you think it's too early. If you're dead, it's too late!
3. Win at all costs. Cheat if necessary. There will be no line judges or referees calling fouls. There is no such thing as "below the belt" in a fight for your life!
4. There's always another threat, be prepared for it!
5. No caliber is too big or too small. No dead man said "I'm glad he only shot me with a .25!". However, you'll be glad they missed you with the .40! .22lr impacts > .45 misses!!!
Well stated.