I do all my wraps using an 'over the top' method where the thread feeds off the spool and over the top of the blank. By turning the blank counterclockwise (down) the thread is turned onto the blank.

I begin by crossing the thread over itself, and am sure to make the crossover directly below an apex.

Next I wrap the loose end of the thread around the blank one time in the same direction that I rotate it. This way I can easily keep some tension on the loose end of the thread which keeps it from unravelling on the first turn.

I rotate the rod once...

... and stop just above the apex that is above the crossover point. The thread should now be snug enough so that it doesn't unravel when I let tension off of the loose end.

Using a pair of fine point fly tying scissors, I trim the thread so there is just the slightest tag end sticking out.

Next I put in a pull loop just above the apex that is above the tag end.

I then rotate the rod 2 more times and stop at the pull loop.

Now I trim and pull the tag end of the thread through using the pull loop.

Before trimming the tag end I snug up all the wraps with a fly tying bodkin, paying special attention to the apexes of the blank. Once it is snug all the way around I trim the tag end, again using fly tying scissors. I can usually get a close enough cut so there is no fuzz sticking out, but if there is it'll be sanded or otherwise cleaned up during finishing.