Do you mean that you have a 2 hour drive from the airport home? Or are you getting on another flight? The reason that I ask is that you do run quite a bit of risk if you planning on getting on another flight and you have not purchased them as connecting tickets. I'm going to assume you mean a 2 hour drive.
You may want to print out both e-tickets (i.e. going and coming home). It sounds like you are driving across the border, but I know I've been hassled once or twice when flying to the US when I've purchased two one-way tickets (since it looks as if I am not planning on leaving the US). I've just shown them my return ticket. Also, this has happened once or twice and I've flown (on two one-way tickets) many, many, many times (i.e. it isn't a common problem, just something to think about).
Other than that (and the aforementioned fee issue - though some airline charge a change fee per direction, so you'd still be dinged twice) you'll have no problems doing what you've suggested.