Don't let the long directions keep you from making this recipe,it's not difficult. And well worth the time!
Unwrap the sheets of fillo and cover with damp cloth or a piece of plastic wrap. You should work quickly to avoid the fillo drying out. Lay two pieces of parchment paper measuring about 16 by 11-inches out on large chopping board. Brush each piece of paper with a thin layer of butter and sift two tablespoons of confectioners' sugar onto each one.
Lay a sheet of fillo onto each of the papers and now brush that with butter also. Continue to layer the fillo and butter on each stack to give 4 fillo layers in total, finishing with a butter layer. Finally, sift 2 tablespoons of confectioners' sugar on top of each. Lay another sheet of parchment paper measuring 16 by 11-inches on top and use this as a guide to trim the pastry edges using a sharp knife.
Next, remove the top sheet of parchment and using the knife, divide each fillo stack in half down the length (to give four 5.5-inches wide and 16-inches long rectangles). Make light score marks (not cutting through) with the knife across the opposite way and at 2-inch intervals to give 8 portion marks when serving. Slide each stack onto a sheet pan, butter the top sheets of parchment paper and place them butter side down on top. Finally, place another sheet pan on top of each stack (which will ensure the pastry will cook thin and crispy).
Bake for 15 minutes, until crisp and golden brown. Remove the top sheet pans and allow the pastries to cool completely.
To assemble, set one long rectangle onto a large platter and spread over 1/4 of the lemon curd evenly. Continue to layer up the fillo and lemon curd ending with a fillo top, to give 4 fillo layers and 3 lemon curd layers.
Using a very sharp knife carefully cut the Napoleon into 8 portions using the score marks as a guide. Sprinkle with confectioner's sugar and serve at once.