Flex, 31 ft is not too much to handle, we sail our Dehler 33 without any problems and it is our first boat. In addition to the reading material, which is a must, I also recommend a weekend or three day basic sailing class, which both you and your wife should attend - it will make things easier and more fun as it will mostly be the two of you on the boat. The last thing you want is for your wife to be 'afraid' of the boat, which can happen if she does not know the basics and you are an inexperienced captain. I would also recommend having a knowledgeable friend or instructor go out with you on your boat a few times, talk not only about sailing but also about seamanship, managing the boat, talk about local conditions, things you should know, ets. This will be good as he/she can explain things and show you things on 'your' boat, and will be available for you to ask questions.
I would have a rigger go over the rig
with you, make sure it is in tune, and that nothing needs to be replaced, have a sailmaker check out the sails and give you an evaluation of the condition, a blown out main or jib
will induce a lot of heel and makke the boat not fun to sail, and have a mechanic go over the engine, check the fuel
filter, etc., you want the engine dependable, and answer any questions you may have.
Last, ask us any questions you may have, we are here to help. My best wishes with the new boat.
Oh, as you are new here, pictures are in order.