Don't know about those lakes - if you got a washdeck yak you can climb aboard from the water - if its one of those sit inside jobs you'll need to sit in it on the bank and push off into the water with your hands.

Excellent forum (and links) for yak stuff at http://www.kayakfishing.com/wwwboard/wwwboard.html

pretty soon you'll be ready for sharkfishing? :)