I learned to...
1) Never, ever go longer than 5 days without detangling. Detangling sessions turns into a nightmare!
2)Moisturize everyday! In 2009 after I styled my hair on day one, that would be it until next wash day. Bad idea! Dry, hay-like hair! It was horrible. In 2010...I'll be making a huge effort to moisturize everyday!
3) Trim on regular basis! I'm trying to grow out my hair and so I thought trimming would just set me back. Actually, not trimming, was what set me back. I had so many single-stand knots and split ends and now I have to do a big trim. This year, I'll be doing search and destroys, to avoid split ends and cutting too much hair off.