Just get one and find a pool, it's not too complicated, your first session you will suck, a first session error I had was using more or less just my legs instead of the full body undulation, but over time you will naturally start to work out a good style just by observing what actions get you farther easier. For a good basic technic look up peter pedersons 200m dyn record on youtube, still one of the best dynamic videos I think.
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