I wanted to share my experience after installing the OEM arm rest. DISCLAIMER: Please - if you're not comfortable with this procedure do not attempt/don't hold me liable if you mess something up. I'm simply sharing what I did to my car for entertainment purposes. I hope that doesn't make me sound like a tool...
As others have done before, I also installed the arm rest without removing the entire center console. I was reluctant to remove the console/etc because I didn't want to damage anything or create rattles.
Although I don't consider it an exotic tool, if you don't have one, you'll need to get an articulated socket extension:
As you can see, the articulated extension allows you to get at the bracket bolts without removing the console.
In order to move the wiring harness out of the way, cutting the harness clip is needed. Side cutters work well, and I suggest cutting the clip with the bracket between the cutters and the harness. By using the bracket as a "backer" you avoid the risk of damaging the harness with the cutters:
In order to install the arm rest mounting bracket, I decided to disassemble the e-brake cable. Although you may be able to get the bracket into position without disassembling the cable, it was just too easy. Here's a picture of the important parts:
To disassemble the cable, remove the nut that attaches the brake handle to the pair of cables. I used a ratcheting box-end wrench to speed the process of removing the nut. The space only allows for maybe one click, but it still doesn't take long to remove the nut completely. Once the nut is removed, the central cable can be separated from the pair of cables. Pay attention to how the central cable is attached BEFORE pulling the cable out so you can reassemble it! Also, be sure to note the tension (or lack thereof) in the cables before removing the central nut. When reassembling the cables, too tight will have the brakes dragging all the time. Not tightening the cables enough may reduce your e-brake effectiveness.
Once the pair of cables are separated from the handle cable, the bracket can be easily slid into position. The rest of the install is really pretty easy, so I won't bore you with further details. Reassembly of the brake cable assembly is simply the reverse procedure as the disassembly process.
Again, I'm just sharing my experience in case somebody was considering this install. I hope the pictures help.
As others have done before, I also installed the arm rest without removing the entire center console. I was reluctant to remove the console/etc because I didn't want to damage anything or create rattles.
Although I don't consider it an exotic tool, if you don't have one, you'll need to get an articulated socket extension:

As you can see, the articulated extension allows you to get at the bracket bolts without removing the console.
In order to move the wiring harness out of the way, cutting the harness clip is needed. Side cutters work well, and I suggest cutting the clip with the bracket between the cutters and the harness. By using the bracket as a "backer" you avoid the risk of damaging the harness with the cutters:

In order to install the arm rest mounting bracket, I decided to disassemble the e-brake cable. Although you may be able to get the bracket into position without disassembling the cable, it was just too easy. Here's a picture of the important parts:

To disassemble the cable, remove the nut that attaches the brake handle to the pair of cables. I used a ratcheting box-end wrench to speed the process of removing the nut. The space only allows for maybe one click, but it still doesn't take long to remove the nut completely. Once the nut is removed, the central cable can be separated from the pair of cables. Pay attention to how the central cable is attached BEFORE pulling the cable out so you can reassemble it! Also, be sure to note the tension (or lack thereof) in the cables before removing the central nut. When reassembling the cables, too tight will have the brakes dragging all the time. Not tightening the cables enough may reduce your e-brake effectiveness.
Once the pair of cables are separated from the handle cable, the bracket can be easily slid into position. The rest of the install is really pretty easy, so I won't bore you with further details. Reassembly of the brake cable assembly is simply the reverse procedure as the disassembly process.
Again, I'm just sharing my experience in case somebody was considering this install. I hope the pictures help.