The soldering on the pandora not that bad... just as simple as holding the iron to the wire and touching it with the solder.... i found it more difficult to wrap each wire around itself than I did soldering them together (which is easy). It is not like soldering an electrical board which requires more skill and steadiness. Tom's directions make this part extremely easy.
Once the wires are wrapped, you want to have something that can hold onto the resister and wires so you can hold the iron in one hand and the solder in the other. What I did was take a book and put it on the edge of the counter and slid the wire under the book, so the part I was working with was hanging out over the coutner... press iron to wire, hold it for a few seconds so it heats up the wire, and just touch it with the solder, it will spread over the wires bonding them, once all the twisted wire is coated pull way with both hands.... your done with that particular piece of soldering, turn wire around so unsoldered piece is facing you and repeat.
and as far as time goes... each part can be done on its own... you don't have to do it all at once. Just do each part when you have 15-30 minutes.... The majority of the time goes into the wiring and building the heat exchanger. Both of which are not that time consuming. All the other stuff involves waiting for the glue to dry. And as far as sanding goes... that is where most of the time will be spend (Although the body is pretty smooth to begin with, just a little finishing on that)