It's tough to get into the groove of in the beginning, because you don't have a lot of money to send her to school and she sucks at her jobs. Eventually, though, you settle into it and it becomes the most freakin' addictive game you'll ever play. Has hella replay value, too, seeing as there are 70+ different endings.
I've played through twice already. My first princess became an Artist and married a wizard. My second (which I cleared earlier today) became a Martial Arts Instructor and married a knight. In my next file, I'd like to see if I can get her to be a magic-user of some sort, ideally a Court Wizard.
I even got DragonMagna to play it a bit. He made her fat by feeding her too much, and she eventually became a delinquent because he made her too stressed out. See? This game's got something for everybody. There are infinite different ways to play through.