APP 985 (Double "P") not the single "P". I put in XP985 a month or so ago in my 06, no problems. On the right side of the engine remove the "rail" bolts, then gently work the rail up n down until the boots come loose. The rail will stay connected and you will move it around as needed. I change one plug at a time, blasting air down around the plug, loosening the plug, another blast of air (this should remove any crap down around the plug), remove the old plug. You can use canned air if you don't have an air compressor.
Check the gap on all the new plugs, .035 is the proper gap. Put some anti-seize on the threads of the new plug. What I do is use a piece of plastic tubing over the end of the plug to thread it into the hole. This makes it easier to get the plugs started and lessens the chance of cross-threading the new plug in the hole. Tighten the plug down tight, then tighten 1/4 turn. (Get it snug, then 1/4 turn). After all six are changed, put some di-electric grease on the plug tips, re-install the rail. Not being a SA, but make sure all the boots are installed and down tight, rebolt.
You will want to remove the airtube, and have a wobble or "U" joint for your rachet extension, as the front and back plugs can be had to get at.
I changed my plugs in about an hour. My Jeep had 49000+ miles, three of the old plugs had the gap out to .046 and greater. Changing the plugs made a noticable difference in start-up and idle. Good luck!