Threading the Loom for Ms and Os

While at weaving class, I started threading the loom's four harnesses for an Ms and Os pattern.

I am able to hold four threads in the left hand, poke the sleying hook through each heddle eye in turn, and in one go draw the threads' tails through, but am rather awkward at it.

The Ms and Os pattern is okay to thread, I can go by the principle that the heddle that's further away always goes to the right of the heddle that's closer to me.