I have quite a bit of welding to do on my s2 erst. I have a range of quotes, the dearest being £450, the cheapest no more than £100.

Ive seen a mig welding starter kit going on the bay btwn £150 to £200.It comes with all you need apart from the metal(!)

Is it worth buying the kit and having a go at doing it myself? My bro in law has done a bit of mig welding before and ive read up on it and seems to be ok.
I can use an angle grinder to cut the metal away. Then i guess its a case of cutting metal to suit the size, clamping into place, spot welding it in place then doing a nice solid weld round the cut.
I know its an art form but with a bit of practice on some scrap metal is it possible to do my own work?