Just a general comment on welding- yes a mig welder is what you want. It’s easy to get started on the less visible/critical bits after completing a course or having someone show you how. It’s definitely a skill that takes time so just get stuck in and you’ll get better at it.
If you randomly spot a mig welder for sale make sure it’s a gas mig (gasless welding is a splattery mess on thin metal) and make sure the welder goes down low enough- you want 30amps min for car bodywork as it’s thin, some cheap welders will only go down to 40amps which will just lead to you blowing holes in the bodywork and a lot of frustration. R-tech and others (Portamig as well I think) have a mid-priced mig with a 25amp min which would be ideal.
Cheers
Edit:
https://www.r-techwelding.co.uk/mig-...tech-i-mig180/