Cornrows, typically braids that are arranged in neat rows and that begin at the front of the head and stretch to nape of the neck, are one of the best hair styles to learn to do on your own.
They are quick to do and relatively easy once you get the hang of doing them. The great thing about cornrows is that they are a good protective style (a style that can be worn to protect your hair from breakage due to daily styling) that can last a few weeks if they are maintained well.