just ripped mine apart today to find out I needed a new one bad...there was about a 1/4" play in mine, and the tensioner was "unlocked" and wouldnt re-lock so that meant it was broken....
No real tips, just take off the fan/shroud/altenator (makes things a lot easier)....use a puller to take off the crankshaft pulley (its press fit on after you take off the main bolt and washer) also, dont forget to take off the 3 bolts that are located underneath the timing cover (these keep the front of the oil pan on)....then when you see the 2 timing gears, crank them so the 2 "marks" are lined up so when you put the new chain on, it is easy to calibrate it.
I would suggest replacing the tensioner & bumper while youre in there (along with all the gaskets)
Any questions feel free to ask......
2012 Overland 5.7L