Specialty welding can be complicated, but basic utilitarian welding is not. Head out to your local tool store, pick up a cheap MIG machine and some scrap steel, and plunk yourself down in front of YouTube for a couple of hours, and then spend a few hours practicing.

Now, this won't make you good enough to weld on a bridge or an airplane, but you'll definitely be able to stick metal together for doing one-off stuff at home.