1999.5 Pathfinder Brake Line Replacement

[nickelghandi]

Hey guys.
I went to move my 99.5 Pathfinder around in the driveway at my parents house after my sister had it out the night before, and noticed the brake light was on. Checked the fluid level and it was totally empty. I believe my brake lines have gone bad and my sister just pushed all the fluid out on her 5 minute drive. I searched around and haven't found any threads yet so if someone is willing to drop a few pointers on the replacement process and if it's worth doing myself or just having done by a mechanic, I'd be very grateful. I have the know how and probably the time as it's not my daily driver. I plan to sell it soon but want it in as good of shape as it can be in beforehand. Anyone done this before and if so how much time is involved? I'm in no rush, but I feel like the longer it sits, the worse other things will get.
All on topic responses welcome and if it's easy enough to do myself, I'll post a how-to with some pics when I get around to changing them.