As GTRDIABLO detailed it.
It may sound a little scary at first, but it's really not that complicated. I know, I did it 3 months ago
One word of caution though, I would only buy from a reputable dealer. I wouldn't risk an individual unless you're 100% sure you can trust them, I've heard too many stories.
Also, as mentioned, you'll need to provide the US border crossing you will use the car's paper at least 72 hours before you plan on crossing. Not necessarily too easy to arrange.
And, the recall letter costs $250, just so you know. The dealer can order it or ask you to do it (through
this website)
The savings are worth it!