What can I do to get my mother off my back about my wedding?

Its a year and a half away and she’s already started telling me “how its gonna be” as soon as another wedding that we were involved with was finished last weekend. She would be ecstatic to just plan the whole thing and have me show up, but that’s not going to happen. She’s very overbearing and critical and when I talked to my father (who is doing the paying) about it, he agreed that we were going to have plenty of problems with this and that I would have to find some way to deal with her brand of crazy. I’m plenty old enough to not need her telling me… well, you can imagine the rest.

I’m looking for ways (practical or evil) to reduce the criticism and make life easier. She is not going to be allowed to plan my wedding (she already had hers, this one’s mine), but that won’t keep her from trying. Any suggestions?