Bro, doing the pads is a piece of cake. For the front just remove the wheel, and look for 2 bolts on the back side of the hub assembley. Take those out and off come the caliper. There is one clip that holds the brake pads on that you nee to remove and then you can swap out the pads. Once you have the caliper off you can just slide the rotor off. You may need a rubber hammer os something like it to gently jar it loose so you can pull it of the hub. Once you do that take it down to a shop to get turned for less than 10 bucks a rotor. I think some of the DIY auto parts stores can turn the rotors for you.
I believe its the same process to do the rears as well. If you absolutely must have someone else do them, then take it to your local brake place and hope they dont eff of the job. Its VERY hard to do on a Maxima, but i've seen them flub it up before.