This one I did alone and it did take a long time to find all these twigs! We have a ton of sticks out here, but you need ones that are mostly straight and smooth. I used a saw and trimmed some of the branches from the smaller trees out here. Others were on the ground. But this is where the kids come in handy! Send them out to find all the twigs. My kids had fun doing this and they found a ton in a few minutes. I glued them on, one at a time with the same weather proof glue.
And yes, this is a messy project.