How did you deal with moving away?

I moved three provinces away to live in my fiance's hometown to be near his family. We'll be getting married within a few hours from the hometown, and now we have plans to move away after the wedding. Selling the house, picking up and moving to where we would both be happy and closer to work for both of us. This involves moving to a different province and being 14+ hours away and not easily able to visit as often as we have for the last three years. His mother has voiced a very negative opinon when we thought of simply moving a half hour out of town and I'm worried of how to handle her tantrum when we tell her we're moving much much farther away this time. Has anyone else had to handle a situation like this, either with a vocal MIL or a quietly negative MIL?