As far as paperwork is concerned check the licence numbers displayed on the hull on the boat, make sure the licence papers show the same number and that the persons name on the licence papers is the same person you are buying from. Next check the Hull Identification numbers are correct. the HIN number should be displayed on the transom . Next make sure that the bill of sale displays the licence number and the HIN number. Also the sellers name and address and the selling price. If a trailer is part of the package break down the amounts to reflect the boat separate from the trailer. You will have to register the trailer and insure it, you will pay sales tax when you do that, the sales tax on the boat comes when the provincial tax people are informed of the sale.And they will be. When you complete all of that go online to Transport Canada and look for the link in the marine section to pleasure boat licenses. You can download the form to send to New Brunswick where the documents are checked and a new licence is issued in your name. You will have to provide the old licence, a government issued Id, photo copy of a passport will do and the completed bill of sale.If all of the paper work is correct and you are still concerned try contacting Transport Canada marine, good luck.