So if someone was going to buy one welder, that would be able to do most everything nicely, a TIG welder is the one to buy? For a DIY'er, who may not weld a lot and has minimal skills (using a MIG, never TIG welded before), which unit would be "good enough" for a budget and how difficult is it to learn how to TIG weld properly? Can you learn via by practicing or do you need a proper class?