Hi Sabra,
It has been a while since I've used CLSQL, but converting should be relatively straightforward. If you're using 'join' objects, you'll have to overhaul that, since Postmodern DAOs work completely differencly (they don't join, for one thing). Also look into the database-connection-error (http://common-lisp.net/project/postmodern/cl-postgres.html#database-connecti...) condition and :reconnect restart if you want to make something that doesn't crash when there are connection problems. ... Basically, just skim the documentation, and you should be fine.
Best, Marijn