Estate planning mistakes can be expensive to fix — that is, when they can be fixed at all.

That’s the thought that haunts New York attorney Mari Galvin whether she’s creating an estate plan for a client or confronting the aftermath when people didn’t properly plan.

“People think, ‘Oh, I have a simple life,’ but you have to understand (that if) you make a mistake and you have unintended results, you can’t bring the person back to sign a new will,” says Galvin, a partner at Cassin & Cassin law firm.

In my latest for the Associated Press, why trying to save money by doing your own estate planning can cost big bucks down the line.