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The only real trick is to get the nail and the bit aligned correctly.
When you build the sled, just screw the front and the bottom together at 90 degrees, put a short 1/8" bit in the drill and feed the sled into the drill bit.
That will drill the pilot hole you need for the nail.
Slide the nail in the hole and then put the support piece on the sled. This holds the nail in place and is the handle I use to push the sled...
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