M.L.
I do messy ponytails, braids, chignons and buns... I'm a hairstylist so there is definitely a right and wrong way to do these. I've had hair to my butt all the way to a gi jane shaved head, so I know hair! So long as you are keeping it trimmed every 6 weeks or so, so you don't have those thinning, straggle ends, then long hair can look very good. Last week, I wrote a blog post on several styles including links to tutorials. Take a look, it'll give you some good ideas:
http://littlelovables.blogspot.com/2011/04/easy-and-simpl...
braids:
http://littlelovables.blogspot.com/2011/03/how-to-wear-lo...