To build your own wind turbine all that you really need is a good set of plans.
There's no reason that any person, whether you be mechanical / construction oriented or not, cannot easily create their very own wind turbine at home for about $150 and start living off the grid with free and environmentally responsible alternative power.
If you own your home and have a space such as a garage, shop, or even nice dry days and have a spare day you can easily assemble your very own wind turbine for very cheap in a single day.
All you really need is:

• Common tools, screw driver etc.
  (most every household has these)
• A space to work in (as listed above most every home has somewhere suitable)
• The desire to be free of electricity bills or do your part to save the environment
• A good set of DIY wind turbine plans

If you posses all of the above then you can acquire the rest of the needed materials for under $200, and a good set of plans will even tell you where to get all of these for as cheap as possible.
Really the basics you need are:

• A D/C Motor
• Some lumber for the rotors (spruce works well in my experience), PVC can also be used, but lumber seems to last longer and be cheaper

Other than that your plans should show you how to get the rest of your materials for free or virtually no cost (used radio/TV tower for free, free used batteries, etc) and you're on your way.
What are you waiting for? Start saving today!