How did you immigrate from the USA to Canada?

I'm a full-stack developer looking to move permanently from Portland, OR to Vancouver, BC. I am curious how people here handled this type of move and have some specific questions.

1. Should I expect a Canadian company to pay for my relocation, or is this hit or miss depending on the company? 2. Were there many unforeseen costs involved throughout your move? How expensive was the move, overall? 3. Did you hire a relocation company to assist with the move or handle all details yourself? If you had a good experience with a relocation company, can you leave a recommendation?