For each tree, you will need paper doilies in 3 or 4 different sizes. Because doilies are so thin, you will want to use 2 paper doilies in each size. Try to peel 2 doilies off each stack without separating them.
Cut one quarter out of each size doily. Use adhesive to glue the two layers of each doily together. Be careful when adding adhesive because doilies are delicate. I like to use a tape runner; a glue stick would also work.
Flip over the smallest doily and place adhesive along one cut edge. Overlap that cut edge with the other cut edge to create a cone shape. Adhere. Repeat with the other size doilies.
Place a wooden skewer next to a ruler. Starting from the pointed end, make small marks with a pencil at 1 inch, 2.25 inches, 3.5 inches, and 4.75 inches (for a 4 layer tree). For a 3 layer tree, make small marks at 1 inch, 2.25 inches, 3.5 inches, and 9.5 inches. Use kitchen shears to cut off the skewer at the 9.5 inch mark.
Pick up the skewer with the pointed side up. Put hot glue all the way around the skewer at the lowest mark.
Poke the skewer through the pointed end of the largest doily and bring the doily up until it touches the hot glue. Hold the doily there for a moment to allow the glue to cool and harden. Try to keep the skewer centered inside the doily while you wait for the glue to harden.
Repeat with two or three more doilies, working from largest to smallest.
Glue a chipboard star sticker or wood star cutout on top of the tree.
Make a stand for the tree: drill a hole into a small wood slice that is the same size as the skewer OR stick the skewer into a floral foam disc. Secure with more hot glue.