If you got the adjustable control arms, check all the grease fittings. Mine were all jacked up. Busted, smashed, different sizes, or they looked ok but wouldn't accept grease. Out of the 16 grease fittings on the control arms, 4 were usable and the rest had to be replaced. Regardless of whether they are working or not, replace the fitting on the frame mount side of the lower control arms with 90 degree fittings. It makes greasing them a lot easier.
Assemble your control arms/bushings the night before to save time on lift install day.
All the hardware with my lift came mixed in one bag. It was a PITA deciphering what hardware went to what parts. You might want to figure it out ahead of time to save time during installation. The instructions lack the detail photos needed for some hardware so you're left to figure it out.
If you're going to drill/tap the lower spring mounts for bumpstops (not included in the lift), do it while the springs are out.
The vent tube on the front diff has a plastic nipple attaching it to the diff. Remove the vent tube from the nipple or you risk breaking the plastic nipple when installing the springs. Ask me how I know
Lets just say that my nipple is metal now.
The extended brake lines are a press fit into the brackets that mount them to the frame. I used a vise, socket, and hammer to get the brackets onto the line. Make sure you have the brackets on the right way because they look like they'd be a beast to get off if you put them on backwards.
The axle mount for the rear extended brake line is about 1/2-3/4" narrower than the factory line. That made it a HUGE pain to get the rear brake lines into the bracket. Very surprisingly, this was the hardest part of the lift for me. It would have been a little easier if I had a second set of hands to help me. I did the lift install alone.
If you have access to them, an impact wrench and air ratchet will become your best friends. Soak the bolts in PB blaster (starting three days ago!). At the very least, have a good 1/2" breaker bar on hand.
Know how to do a basic front end alignment. It WILL need to be done.
Be prepared to deal with driveshaft vibration, whether its a TC case drop, SYE, MML, whatever.
Ratchet straps came in VERY handy when it came time to center axles and get control arms lined up with their brackets. I used up to two at a time. Remember...I was by myself, your experience may be different.
If you have anything heavy on the front end of your jeep, you will probably want to install 3/4" spring spacers in the front to keep things level. I don't have anything heavy in the front and still used a 3/4" spacer to keep it level. Your install might not need it, mine did.
If you use the drop mount bracket for the front track bar, use the drop pitman arm. If you don't use a drop mount bracket, don't use the drop pitman arm. After seeing the rough country track bar, I bought a JKS track bar and sold the RC track bar.
Have fun, take your time, and be prepared for something to go wrong....