GA seems easy to install. Sign up, put their JS in a header file, and you’re up in 5 mins.
However, I realize that I made a mistake by selecting default permalink settings within WordPress. You can’t do analytics without meaningful page URLs. Mine look like: http://www.peining.com/?p=2981
(Resetting the permalink template within WP doesn’t work completely. I’ll post again after I find a solution for changing WP permalinks to already existing pages and postings. There may need to be manual database updates, or a restart of the webserver, which I’ve tried just now… It’s getting late now. More to come.)