Hello Beastchug: Yeah look at the U-Tube, and Google for videos and diagrams for soldering the PL-259 connectors.
Also suggest you get a hand full for pratice! Get the expensive type the Silver Plated, with the Teflon Insulator.
This is a help in the soldering process. The Nickle Plated PL-259 Connectors can be a real pain in the a$$.
You will need a approx 100 watt soldering Iron. I have a 100 watt soldering Iron with the tip filled down with a little nub on the side that will fit thru the PL-259 holes, while the flat part of the soldering Iron will rest on the PL-259 body, this transfers the most heat quickly. You want to get on the PL-259 body to solder the 4 ea holes one at a time. Get on with the soldering iron then get off after making your solder joint. I have the coax lightly held in a Vice so that I have a straight down access to the soldering holes. And the PL-259 connector is level.
Also a help is using a Chin Saw sharping file, a narrow round file, and filling the 4 holes cross ways making a small valley above the holes, allowing the solder to stick to more of the connector body, and it seems to make it easier to solder.
Some coaxes like LMR 400 will not take a lot of heat, as to much heat will melt the inner insulator and possible short out the PL-259. Again pratice makes perfect.
I wish I had a dime for every time some has said "Heah I had the PL-259 Connectors resoldered" and now I am up and running. Just for your information, many old timers can't solder the PL-259 connectors.
Good luck.
Jay in the Mojave