Don't turn the rotors unless they need to be as that weakens them and makes them more prone to warping. Are they not working correctly? Again, do the lines before you do anything and get the speed bleeders to make the job easy. I changed to the powerslots (had toasted a stock rotor) and their performance pads and could only tell a minor difference. Changing the lines made a MAJOR difference.
To change the pads, you'll need a large C clamp or a large pair of channellocks to push the brake piston all the way into the caliper. If you have the caliper off for an extended period, it is a good idea to put a small piece of 2x4 in the caliper to prevent the piston from extending all the way out and making a mess (plus it is difficult to get back in the caliper if it comes out)