It's not that hard, and you don't need to use electricity to heat the wires for less than hundreds of frames.
Here's what I do: Put the brass inserts into the holes in the end bars. Not absolutely necessary, but the wire can slice right through the end bars if you don't.
Drive a small nail into the end bar on the side below wide part (so it's not where the end bars touch in the hive) and another next to the bottom hole. Leave the head sticking up for now.
Thread the wire through the holes, starting at the top of the frame an going side to side to give you two or four wires across the frame. Use a pair of needle-nosed pliers to wrap the wire around the bottom nail and drive the nail home. Pull the other end of the wire as tight as you can with the pliers and wrap it around the other nail, drive the nail home, and clip the wire off. You can use the spool to pull it tight or get (or make) one of the little dispenser things. That wire wants to unspool and make a big tangle, the dispenser is nice, but you can't use the spool to pull it tight, you have to cut it and pull with the pliers.
Once you get the wire nailed, you can tighten it if it's too slack by grabbing and twisting it with the pliers or by using a crimping tool. Either way, you want it tight enough to "twang".
Put the foundation in the frame and nail the wedge if you use that style frame. I alternate sides with the wires, but you can put them on one side if you wish. If you use crimped wire foundation, you need to have at least some of the cross wires on the side toward the way it bends.
I embed the wire into the wax with an embedding tool. It is a star shaped roller with about a dozen points on it that force the wire into the wax. You will need something behind the wax to support it. I use a bit of scrap that fits inside the end bars, but you can buy a fixture for very little cost that works well, too.
Other than the wire coiling up into a tangle, this is easier to do than to describe. I can wire a shallow or medium in less time than it takes to type this up. A deep takes a bit longer.
Wiring the foundation in is a great thing -- it stays flat, so the comb will be not only flatter, but the center won't be offset, it won't sag, it won't bend (crimped wire for the foundation comes on spools, and always bows when the wax gets warm -- the only way to keep it flat is to crosswire). Best of all, the comb won't fracture and fall out of the frame nearly as easy.
It is important to get the wire into the wax though -- if it stands free of the foundation, sometimes the bees won't build comb over it, leaving a trough through the comb.
Peter