For a clear, simple, easy-to-follow set of instructions on this arcane art, go to blueheronkayaks.com.
Click on 'Forum', then on the 'Kayak Building' site, and take a look at the current post from Glen Smith headed 'Posting Photos'. Even I - a technically illiterate 69 y.o. who missed the electronic revolution (though I well remember the industrial revolution) - think I could follow these instructions and I certainly intend to have a go!
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As a bonus, you'll access at Blue Heron Kayaks another outstanding resource on kayak and kayak-building matters.
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