My late M-I-L lived in Guad for 28 years. Was very close to a family there and we still are. I went to many parts of the country and even went birding with a cousin of theirs way out in the sticks. I would not consider even visiting Mexico anymore.
The stories of Americans moving to France and Spain without learning the language are myriad, and they wonder why it's "hard".
Have some freaking respect for where you're moving.
We're visiting France in just over a week and we've been taking private French lessons since last October. Not doing great, but we're making progress. Going to do our best to be "good" visitors.