As far as towing is concerned, Practice, Practice, Practice, and you'll be an old hand at it in no time. Find a big parking lot (a Church, during the week, for example), and bring some things such as lawn chairs or something to try and maneuver around. Have DW help you with backing (Walkie Talkies are handy, but you should also learn hand signals)
Remember, everyone that you might consider as an EXPERT with these rigs, had to learn, just as you are going to have to learn.
Finding someone (a friend?) who has one, or has towing experience will be helpful too.
As far as trying not to kill each other....well, a large 5er, will give you plenty of room, even two bedrooms, if it comes to that:) The fact that you've been with each other for 31 years (I just passed the 33 year mark:)) means that you can probably work around a small "home"....even if you have been used to much larger. Was your first house/apartment 5000 sf?? I think not. You'll do fine!!
Good luck with the sale.....