Well, your story sounds very familiar.
I saw my Mooney advertised in 2002 and after a long back and forth price, pre purchase etc. we agreed on a price. My Mooney and I became good friends right away. I had to go to West Virginia to pick her up. Although I had 600 hours total time, I had only one hour of Mooney time in a 201. I got to the airport, of course later than I planned, received the keys from Steve the broker who helped me close the deal (great guy!) and after a short intro to now my N9341V I was on my way back to KGAI. Naturally, Murphy is always present..., weather deteriorated and became IFR. So here I was flying an unfamiliar airplane in IMC... The only familiar avionics was my portable GPS...
I landed with a strong crosswind and that was the start of my long friendship with N9341V, since then we had many adventures together (including flying close to active volcanos, crossing the Caribbean etc.) but I will never forget that feeling when I was on downwind to runway 32 in KGAI and I just realized that I had to land with crosswind that I had never experienced before and in an unfamiliar airplane.
Oscar