I can imagine that you must get a good lawyer to avoid screwing up. I just watched a video of an American lady (being interviewed) about how she is not going to stay in Mexico for the long term. And this was in Lake Ajiic, a place full of expats.

Listening to her speak, she was comparing everything there with her life in the US and she has 6 grown children in the US. Then she was thinking about learning Spanish? What is there to think about? The entitlement mentality makes me embarrassed to be an American...