I've added Google Analytics to my blog. Not because I'm a creepy stalker, but because I'm nebby like that. It'll tell me where people are reading from - just city/state or country (not that I'm conceited enough to believe I have foreign readers... my brother goes back to Iraq shortly and I'm curious to see if the military will let him see this).
You don't have to do anything. Nothing changes on your end. I'm not even sure what changes on mine, to be honest, because I am not the computer guru of this house. Bucket thinks my blog is silly and he is not interested in helping me figure anything out, so I guess we'll see if I can do it alone or not.