Dude, you can find replacement videos for pretty much any part in any appliance that are just some dude walking you through it because they just did it. I'm not sure where you're seeing scam appliance repair guide videos.

The way you buy parts is you go to a part seller webpage where you enter the model number they'll have a parts diagram and you select the part you need.

There's pretty much zero chance that welding would be required to change a part.