The very easiest plait is one with three threads, but you're all too clever for that so here's how to plait with five.
Start off by cutting five lengths of your thread. Try to make them all about the same length.
Take one end of each piece of thread and tie them together with a simple knot.
Now tape the knotted end of your threads to a tabletop or any clear, steady surface where you can do your plaiting.
Lay the threads out flat in front of you, like in our picture.
Start with one of the outer threads, it doesn't matter which side.
Cross it over the two threads next to it and into the middle.
Now do the same with the outer thread from the other side.
That's all you do! Keep going, always crossing the outer threads over into the middle and remembering to swap sides each time. Remember as well to tighten the plait each time you cross over - pushing the plaited section gently up to the last plait each time.