It's a pretty simple job actually. I had one on each side go out on my 07. You never have to mess with timing.
Once you get the valve cover off, take the bolts out of the cam, keeping pressure on it the whole time so you don't damage the threads and it doesn't fly out. When you get the bolts out the cam WILL have pressure so try to ease it out gently. Since the rocker arms usually go out on the back it works out well, just lift the back of the cam and leave the chain (on the sprocket on the front of the cam) where it is. Once you have the cam sitting comfortably you can just pick up whichever rocker arms you want to inspect and replace. Might as well inspect the lifters as well but is most likely a rocker arm. Also, you can inspect the cam at this point if you haven't already noticed any issues. Just compare the lobes on the back with the others and you'll definitely see if there is an issue.
Once you get the new parts in place, move the cam back into position and lightly snug all of the bolts, then torque them to spec (in the right order) and then just put everything else back.
Here are some pics from when I did mine so you know what to expect.
You can see how I just have the cam propped up. The picture of the rocker arms, you can see the front one is severely damaged, it wouldn't even move. Also you can see my cam is very worn on a couple lobes, I reused it and it sounded and drove perfect, BUT 30k miles later I'm about to dig in again because I have developed another tick. Not 100% sure but I suspect the cam tore my new rocker arm up.
Let me know if you need any more info on it. And good luck!