No worries, you get better as you go.
These mig welders have gotten so affordable anymore. You can get a really nice home shop unit from Lowes, Homedepot, Tractor Supply, and even Walmart for under $400.
I finally broke down and bought one after always being on the string trying to borrow them from my friends. Man...and I glad I did. One you have one in your shop you will find a use for it almost every weekend.
I am constantly tacking brackets to things, fixing things, customizing things, and even making tools to help with other things.
It is easier for me to put flux core wire in my MIG so I don't have to keep up with the gas bottle. You get the better looking cleaner weld with the gas though.
Practice does make perfect. I know Radrambler was first struggling to plate his firewall. However, now that he has been playing around with it more his welds look pro all the way. Just takes some time. The best thing to remember on light finish type work like the firewall is that LESS IS MORE, in terms of heat and speed so you don't blow through. Also, watch the thickness of your wire. You want the .024 wire on the light sheet metal and the cleaner the surface the less problems.
Sounds like you are having fun!
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