Hey, good job!
Get a multimeter, btw; every man needs to have one. You can use it on so many things on the Jeep, it's not funny.
The left cig lighter is the one to use because it's switched. There are times you might want to leave something running when the heep is turned off, but you might space and leave the cb on for several days and kill your battery. I did that on a camping trip a couple of decades ago...
Every SWR meter is a little different. The quickest way to tune your antenna is to set your radio to channel 20, flip your switch to cal, key the mike and turn the knob until the meter zero's out. Then flip the switch back and key the mike --- at that point you adjust your antenna up/down until the reading is as low as possible.
By tuning to 20, you usually get the lowest general numbers across the entire range.
Read your meter's instructions though or find them on the web; they're very simple but if you use them wrong you can harm your radio (or at least make it transmit poorly).
And about the meters I use, I'm the senior admin in an Agilent test and measurement training lab; some of the meters I get my hands on cost more than my house. I don't actually own any of these... ...but they are uber-cool devices.
Safety fast, Bill
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.
- Helen Keller