...Pay attention to the size of your tools.  If you don't have a chisel narrow enough to fit into the baseline then it won't matter how precisely cut the dovetails are.  Also your saw needs to have a really fine set.  In the example I show in the video I'm starting my tail cuts practically right on top of each other and a tiny amount of set would alter the look of the layout.  My finished tails have a gap of less than 1/16" between them.  Additionally the marking knife you use to transfer tails to pins needs to be able to reach into the gaps between the tails.  Possibly switching to a pins first approach would make the transfer easier but think about it and the tools you will use to make sure its possible.

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Really cutting tiny dovetails is the same but with less margin for error.  Your saw cuts needs to be dead on and you may just need a magnifying glass when it is time to chop back to your baselines.