Is switching my flourescent light fixures to LED fixures a DIY project?
Fluorescent fixtures are fairly simple to work with. There are LED tube bulbs that will plug right into the system without touching the ballast, but these cost more and are less energy efficient. Upgrading your existing fixture to ballast-free LED's should be easy- mostly consisting of just removing and throwing away the old ballast and rerouting some wires. If your existing tubes are not T12 you would also have to change the tombstone connectors.

There is a better article to read here at EarthLED that describes different fluorescent tube replacements and how to use them. Here is a brief excerpt from the article:


  The oldest but also least expensive and most widely installed option
  is the ballast bypass or direct wire LED fluorescent replacement tube.
  Instead of building expensive circuitry inside to enable the function
  with a ballast, this option instead allows the user to bypass the
  ballast entirely and run directly off of the line voltage at the
  installation.