[Brucedriver]

1. You will not need to remove the brake lines to replace your brake pads. I'd suggest picking up a Haynes or Chilton's repair manual for your vehicle and looking at the front brake pads replacement section. Have confidence, however, because the job is actually a very easy job.
2. The wear caused by friction between the brake pads and brake rotor should be the entire width of the brake pads. If this is not your case there are several causes and all will require someone with a fairly thorough knowledge of disc brake systems to properly diagnose.
3. Whether the right front or left front brakes wear at a higher rate than the other side, barring any mechanical problems, is normally caused by driving habits (i.e. trail braking into turns).
4. The rust that is forming on the friction surface of your rotors after a couple days of sitting is very normal. This exposed metal is unprotected from the elements and corrosion.

I hope this helps. Feel free to email me if you need additional information.