This past week I began installing retrofit HID BiXenon projectors in the wife's 2013. Last month I installed capped HID fog lights. I didn't have the experience or time to do it all at once, so I went with TYC replacement units ordered through Amazon.com for $125 each. This way the GC didn't need to be down while I took my time and if I broke anything or screwed it up, I could just stop, put it back together and I didn't mess up the OEM headlamp units. (which I'll have as extra's and the TYC aftermarket units are identical). Using the TYC's was a blessing in disguise.
I'll start by saying I would have never attempted this without How-to's like the OP"s and this one, How-To: Fog light HID kit in 2011 Jeep Grand Cherokee (pic heavy)
The TYC units separated in five minutes after baking at 225 degrees for 14 minutes in the oven placed on a clean white towel. I only had to use a clean stiff 1 inch putty knife to separate the halves and then used a clean round punch to run in the warm butyl sealant to make a smooth track for re-sealing when I go to seal them up.
I will follow again the removal instructions in the previously mentioned fog light "How-to". So far I've assembled the wiring harness, it is simple plug and play from RetroSolutions, I've installed the projectors and shrouds, and now I'm just waiting for enough downtime to install It is a serious pain in the ass in some regards.
I found that removing the complete front bumper was actually pretty easy and choosing TYC units has made it simple to separate the lamp housings. I'll update as I move on.
(And before you remove anything mark the OEM headlamp aim on a garage door or wall first, then leave the tape up. 25 feet back, measure from center-line height and width of the center of low and high beam, etc. That way when you install/align HID's you already know where to aim them.)
I went with RetroSolutions, PROJ-MINI-BIX Mini BiXenon Retrofit Projectors, 35W-DIGI-KIT-HEAD 35W 4300K DIGITAL HID KIT for Head Lamps, and RetroSolution wiring harnesses because they come completely plug-n-play and assembled and even I cant wire it wrong. Their Tech Dept. also responds to every question I've ever had the same day.