If you are using a three reel system, unreel one strand at a time and tie each into the final end post in turn. Don’t pull out all three strand at the same time (even if you know which is top, middle and bottom) to cut down how many circuits of the field you have to walk. If you do there is a liklihood that the strands will wrap themselves around each other resulting in a few disheartening hours unravelling them again. You probably know this already. So do I.