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.
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.