We live in Canada and purchased two US boats. It was not difficult. Be sure the seller really owns the boat. It should be US documented, that will make it easier to get the Canadian documentation.
The contact for the Canadian documentation was,
Don Powers
Registrar of Vessels,
Transport Canada,
4900 Yonge St.,4th Floor,
Toronto, ON
M2N 6A5
416-973-8142
toll-free 1-877-242-8770
fax- 416-973-8133
mailto:don.powers@tc.gc.ca
website:
http://www.tc.gc.ca/eng/marinesafety/oep-vesselreg-registration-menu-2311.htm
Call Don to get advice on exactly what documentation you will need to get your Canadian Documentation. They are very helpful in this office and can save you lots of problems if contacted beforehand.
If the vessel is purchased for export there should not be any local taxes to pay.
The selling broker should help with de-registering it with the US Coastguard. If there are any liens against the boat they need to be removed before the Coast Guard can do anything.
good luck, Bob