I also cut my hair myself. It's not a pretty sight, believe me. I do not have very nice hair, but it is quite abundant and more or less shoulder-length. My method is as follows:

  1. I set some newspapers next to the sofa
  2. I lie across the sofa with my head sticking out of it, over the newspapers
  3. I arrange my hair in a pony-tail, with two bands.
  4. I cut the hair between the bands with some normal scissors
  5. The cut hair falls on the newspaper and I retrieve the band.
And that's it. It's quite simple and looks reasonable (I will never win a beauty contest, not even if someone fixed my hair). I hope my hair grows longer so that I can see what I am doing. Oh, I usually do that every two months at 1:00 AM.