Spooling line with another person makes life easy, they can hold the spool a bit of a distance away, and put some tension on by using their hands either side of the spool, don't wind too fast, because friction will burn their hands! Never pull line through a cloth or similar when spooling, always use something that tensions the new spool. One thing I always do, and I have no idea why I am paranoid about it, I never thread the new line through the tip, always a few guides down, the thinking is, new, dry line is being dragged over the same spot on the tip (probably at right angles) for hundreds of metres of line, under tension, I just reason it might wear a groove in the tip! Probably not so important these days with better guide materials?