make sure you do some kind of course in welding before you try or it will turn out shite, I'm a second year sheet metal apprentice, and my dads my tafe teacher and tradesman who i work for, tig is easy if you can do silver braising and other braising, arc is super easy and good, probs wouldnt do it on a car unless last resort migs good and tig if you want it super perfect quiality strong job.
just do a tafe course cause all the overheads assosiated with a welder are way to much, remeber most good welders require 3 phase power as well, then gas and all the other shit. arc it or use one at tafe.
Travis