That is exactly my situation: I've been working towards this for a long time, am about to do it, and don't have anyone but DH to discuss it with. If I told my friends, they would be very envious and uncomfortable. If I told my family, they would make other plans for my money. It seems like this is a solid plan, but without outside eyes on it, who knows what could have been overlooked?
Yes, it's hard for me to walk away from a big salary. I don't expect it to be waiting for me if I change my mind. I have seen a lot of capable, talented people unable to get hired. I've been in OMY mode for a while now, because I can just keep putting one foot in front of the other and earn big bucks. It's not killing me, so I can do it. But lately I've been thinking about the years that I will never get back.
Thanks again, to everyone who gave feedback. Even the posts that doubt my sincerity have been helpful. It all paints a picture that I'm not missing anything crucial, which is my main concern.