Before making an attemp, a person should research to discover if they have a one of a kind, rare item that people will pay a lot for and will restore, or something that was produced by the millions.
I have seen people get a hold of a fancy leg florence cabinet (worth about $1,000 for the legs in any condition) and then paint it or cut something off. They had no idea how rare it was. I've also seen people take a basic Singer treadle and put a lot of time/funds into restoring, and then wonder why they can't sell it for $200.
But often it's the challenge - I spend $200- $300 and lots and lots of time to make a specific quilt because I want the challenge - and then I give it away. But at least I'm not cutting up a $1,000 antique gown to make a $300 quilt.