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These are really easy and require pretty much no money, no skill, no precise measurements, nor attention to detail.
And they work nicely!
Seriously, try it out and see. This project is doable with almost entirely salvaged materials so it's a perfect first foray into mid sized wind projects.
Step 1: What you need
-Saw (circular saw recommended)
-Angle grinder with sanding disk (maybe you could use a sanding block)
-About 1 hour per blade.