It's a pain in the ass.
Basically, unless you get a position that involves specifically US law (such as private counsel, etc.), you're in for a long ride. There's a series of qualifying courses you have to take on top of your JD which amount to almost a year's study. Then you have to write the bar exam and actually wait to be called to the bar (stupid British rules -- don't ask me why).
The amount of study required lessens with the amount of experience you have, but not considerably. Also keep in mind that lawyers get paid less in Vancouver than they would in the major markets in the US, whereas the cost of living would be comparable.