Well --- if you really get down to it -- there is "metal working" -- and there is car building the "normal way". The normal way is making a patch panel - welding it in -- grinding it down without compromising the body --- and then slathering bondo on it and doing some bodywork.
Don't kill yourself if you're not building a 1.3MM SEMA car.... A thin skim coat of bondo and some primer and block sanding works just fine. I prefer low spots over high spots... high spots are a biatch...
I'm being totally serious here.
Few people are ever going to do enough work like this to be doing "metal work". TIG or no TIG... TIG is just a finer art of welding - and it is more versatile - cleaner - and blah blah blah... but being able to TIG won't make you a metal worker so don't over estimate its significance.
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