You can use this:
4.0L Timing Chain Replacement - 1
It's written for the 4.0, but I used it when I replaced the chain/tensioner on my 2.5l. It seems like it would be difficult, but it really isn't, and I'm no mechanic. It just is time consuming since you have to remove the fan, fan shroud, water pump, harmonic balancer, etc.... just to get to the timing chain. Once you get to the point where you take the cover off, the chain just slips off and you slip the new one on.
Make sure you replace the tensioner; my chain was fine, but the tensioner was in pieces which is what was causing my noise. I replaced the chain anyways though just because I was in that far.