Got it done. I bought both the water pump wrench and the cam sprocket locking tool and am glad I did. It took some effort to get the sprockets lined up and secured and then install the belt was and I can see how the previous installer messed it up. Same thing happened to me a few times before I marked the belt and sprockets with correct, corresponding marks. (I could tell they were one off and adjusted the marks beforehand). Once I had something to aim for it was easy.
Lining everything up fixed the loping idle. Runs real smoothly now. Couldn't have done it without this write-up and these comments.