Hi and welcome to the Cruisers Forum.
As to how an Island Gypsy
51 might handle there are only a few owners of large motor
yachts on the forum. There are specialized Trawler forums
that may be of more help.
If don't have much experience then it may be wise to do a course on this type of boat before buying
one. This would also help with getting insurance
(Don't leave home without it).
As a general observation no boat is easy to manage in a strong cross current
and the high freeboard of the 51 would make managing the boat in high winds problematic.