Step 2Cut Legs to Length
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This is the step you'll feel the most once you have your finished product. The best advice is to find a table you like the height of, and copy the leg length. I cut my legs to 29", and they're just on the edge of being too long. But I'm a tall guy, and with an adjustable chair it's very comfortable- if anything a taller desk forces you to sit with better posture.
When working with a 12' beam, we chose to cut it into quarters, then down to our desired size. Wasteful yes, but easier to manage and keep square.