Birth of a 1970 Dart Convertible

I'm having a hard time welding the floor pan back together. I got a mig with shielding gas. I don't have any pictures; I just had to walk away I was getting too frustrated. If I had a tig would that easer to weld? I'm not one for buying china tools but harbor frieght has one for $400.00. I laid all my blocks for my basement, built my log house my kitchen cabinets, dressers, baby cradle and so on but this welding thing is pi$$ing me off!!!!!!!!!!!!!
HELP!!!!!!! :banghead::banghead::banghead::banghead::banghead::banghead::banghead: