Consider getting a partner. Consider very carefully, and make sure the partner and you have similar or complementary goals with the airplane ownership. There are a lot of downsides to a partnership, so be sure that you address these potential problems in any partnership documents. It is true that a handshake deal CAN work, but don't count on it. The two biggest sticking points seem to be an appropriate flight time cost for engine replacement or overhaul and the eventual dissolution of the partnership.
Get a very good inspection of the aircraft prior to purchase.
Fly as much night cross country as you can. Rent a basic instrument capable aircraft once a month and get a couple of hours of actual instrument time.
Good luck.
Joe