Hi, I've made them before, they aren't too difficult. The hardest part was clearing it all out before I could cut them. I've heard of a few techniques that make getting the milk and meat out of the coconuts easier, so it's probably worth researching that to get some ideas of how to simplify it. Once it is dried and clean, cut them in half (if you haven't done this already) and I like to drill a couple of small holes (1/4-1/2" or so) in the top- the store bought ones have these sometimes and I guess it's for airflow so it isn't so stagnant and the eggs don't mold over. Then I just used a jigsaw to cut a little notch in the front for them to enter.
Good luck.
Bryan