|For nine years I threaded my Janome Harmony serger from right to left, as per instructions. Last summer I purchased a Brother 1034D serger, and the instructions said to thread the upper looper first, then the lower looper, then the right and left needles. That means you should thread number 3 first, then 4, then 2, and then 1. I did that a few times and found it frustrating because the upper looper being already threaded was in the way. After that, I started threading the 1034D from right to left, just like the Janome. It works fine, first time and every time for six months now. Really, as long as the 1034D is threaded correctly, it doesn't know the order in which you threaded it!
Of course I cannot recommend this for all sergers, but if you think it's easier this way, like I do, then I don't think it will ruin your serger to just try it. If all else fails, follow the instructions - lol. :-)