I bought a BabyLock serger 15+ years ago at Cloth World (later bought out by Joanns)....I wish I would have gone anywhere that would have given lessons. I usually am able to teach myself just about anything, but I have never been successful in doing so on this serger.
So it has sat in a closet for most of those years unloved, untouched and unused. It is one machine that needs instruction, hands on, not just via self learning. So I would only now buy a machine from someone who also gives lessons -- and the first few should be FREE!