Take your time, a series of short tack welds and a shot of compressed air to cool works well. Good to blow out fires as well. Might be a good idea to pull tank and cap lines for safety.
Thanks! The car is on a rotisserie and is everything is pulled off. I am feeling pretty good, technique wise, I just need to setup the welder properly. I can weld pretty darn good with the flux core, but never tried anything as thin as body panels.