I just replaced my timing chain. I've never done it before, either.
Here's my thread on PFF. I did it with the engine in the car, without touching the cradle. It was cramped, and a few of the bolts were a pain (but you've already done those).
The most valuable resource I had was
this video. Granted that's a Camaro, and the water pump and hoses are different, but it is effectively identical past that.
I replaced the chain, gears, and tensioner/guide. The gears themselves have marks that should line up (point toward each other). You'll be pretty close still, so you just install the chain carefully.
When reassembling, you'll probably turn the crank a bit tightening the crankshaft bolt, so you'll need to find TDC. I used my dad and a straw in cylinder #1. We then adjusted the distributor so the rotor was pointing at #1, then set the timing.