When ordering the resistors double check the type your vehicle uses, because some models use a 5 pin resistor, while others us a 4 + 2 (Sometimes listed as 6 pin) resistor, and they're not in any way cross compatible, and in my experience you usually have to order the 5 pin variant.
Other than that they are super easy to replace. The front resistor is behind the glove box and is held in with 2 5/16 or 8 mm bolts, and the rear is right behind the right rear pillar. You don't even have to take the whole cover off, just the piece covering the gate latch, and pop the 2 or 3 retainer clips to pull back on the plastic enough to get access to the resistor. You can't miss it because it's like the only thing in that location.