It doesn't require an electrical license or degree to weld, but I happen to have a Masters and after about 40 years doing it will retire in another year. Some of the things you suggest like running 2-120 volt lines to get 240 volts and just changing out the fuse at home is not remotely intelligent, or safe. I am being blunt because subtle isn't getting through to you, and no one is trying to insult you, but you are not paying attention,
You dont have a welder so we suggest you go to a local welding supply house. They can get you training on how to use the welders and suggest a unit that meets your needs, may even get you a used unit that can save you lots of money, like they did for me. Local store also have support for long term issues that mail order or a big box store cant do