I used to have a Peugeot 753 pro (nice bike, rest in peace) with 7 speed Ultegra. On upgrading to 10 speed campy, I just stuffed the wheel in and tuned in the derailleur. It worked smoothly, didn't even think about cold setting the frame or have to.
Advice - see if it works, if it don't then go then go to your LBS.