I broke the front passenger side brake line while working on the brakes. I have ordered the pre-bent replacement. Any ideas or advice for an efficient removal and replacement of the old line? Thanks in advance!!!

Soak the fittings in a penetrant a day before you do the job. Use a quality set of flare wrenches. If you use open end wrenches or pliers, you'll just strip the nuts. Take your time loosening the nuts, go by feel. Once you break the hold, you're good.

The pre-bent lines are the best way to go. You won't have any trouble putting the new line in. Be sure to bleed the line well, and check for leaks.

Good luck.

Along with a shot of penetrant before hand, and a good line wrench, always remember to TIGHTEN the fitting a little first, instead of just trying to loosen it. Tightening fasteners/fitting a wee bit before taking them off always seems to break them loose easier.
Another trick I've learned over the years when I have a stubborn fitting is to put my line wrench on the fitting, and smack the tip of the wrench with a hammer a few times. NOT from the side, like you were trying to loosen it, but from the very END. This seems to work best for me. Of course, there's always that ONE that just ain't givin up without a fight, and you wind up with a  torch...threatening to burn the whole dang place down.....