Hey Deano, building the RS I got away with a basic mig, grinder, hammer, dolly, sandbag and magnets. You can do most folds by clamping the metal on a straight edge in a vice. Also used a variety of curves to form things, and my old potbelly stove had some useful radius to work from, lol. You can also use pieces of round wood too. Sandbags are handy and easy to make, using sand, leadshot or acrylic beads will all have different effects. In saying all that I bought a couple of repair sections that just would've taken to long and were out of my skill to make.
Trial and error is important, I'd fail miserably, walk away, come back with a fresh head and try again.
Welding wise I was taught without gas first then once the argon was turned on it was a whole new (easier) world. It took a few weekends of welding scrap then cutting it in half and welding it back together before I touched the car, its amazing how much practice you can get out of one piece of scrap metal...
Heaps of stuff on youtube too, great resource to learn from I'm still just an amateur and still go back there for advice .
Good luck with it Drew..
*EDIT* one last thing, about to start the welding on the Cortina and I'll be buying a decent welding jacket this time, haha, no smell of burning hair and flesh in the garage this time