Here's my first Catfish Loop. I left my original loop on there for comparison and also because I need to make sure I have the lenght I want before cutting off.

Thw things I learned: Start closer to the knot end and finish further near the top with my wraps. Other than that the loop isn't hard to do just takes longer than a regular loop. You can see on the right side where I tied in a few extra knots to fill in the space. So, this one gets cut off and I do anotehr one that is shorter by a small amount.

Thanks again for the link Straightarrow.