I'm glad that I'm not alone here.
I bought a serger 10 years ago and took it out of the box read the instructions and put it back in the box.
I finally ask my husband if he could try to thread it. 1 hour later he had it threaded. Now I never change the thread and when it runs out I tie the new to the old and run it through.
But there must be a easier was to thread them.
Mine has red thread where the red instructions go Blue where the blue go and so forth. I rainbow serge but I use it on the cut ends of fabric before I wash it.
Good luck we are all in the same "boat" when it comes to threading the "buggers" kjym Kathy