Do Not buy a HArbor freight hood! yes you can get a small lincoln or miller 140 mig with a 75/25 gas shielded bottle.
The number one thing is make sure he has proper eye protection at all times. Auto darking hoods are okay, buy a name brand or go with a simple fixed shade that cost about $30 bucks. The fumes are not bad, do the work in a open area and clean ur metal.
I have done this everyday all day for a long time. If you need any advise i will give you my number.