I was looking for tutorials on how to tie a Spanish ring knot, and was surprised by the lack of tutorials. Here's a tutorial for anyone interested in learning to tie a Spanish ring knot. I highly recommend starting in a larger scale than model scale, otherwise you'll want to poke your eyes out with a fork after two seconds.
Dowel or something cylindrical
Start by wrapping your rope around your dowel. I'm using 550 paracord an a wooden mallet.
Then bring the rope back around and run it under the upper right strand of the knot.
Pull the X that is made by the two crossed strands down,
And run your rope through the gap.
Pull the rope downwards so you still have a gap.
Grab the rope on the right side of the gap, and cross it over the left side.
Run your rope under the part that is now the right side of the gap.
Then run the rope under the knot.
Next is tightening, I find it is easiest to hold the standing end(the end that isn't being used), and tighten the knot from the standing end, working through each step of the knot.