I currently have 400 hours. I am a rookie pilot. My wife and I own a 1963 Cessna 172. We have flown it from coast to coast and into Mexico a few times. But we are tired of doing it at 105 Knots Lol. I am using my plane now to do my instrument training as I have a decent panel and GPS. I am almost done and ready to test. I am seriously considering selling my 172 soon after I get my instrument rating. I am 5’07 and my wife is 5’02. We don’t have kids and 90% of the time it’s just us. I have never even sat in a Mooney. I have only flew Cessna (170, 172, and 182). I am considering to look for a M20C. I would love to hear advice. How hard will the transition be for me coming from a 172 to a Mooney? What do I look for when buying one to ensure I am not getting one that needs expensive maintenance? I don’t know anything about a Mooney other than every owner you meet loves their Mooney. They are fast and sip on gas. We live in Montana. The Aiport it would be based at is 3500 MSL. Would that be an issue?