Since you say ito wrap and not just cord wrap I will assume that you are doing a katana.
I just did my first and pored through various tutorials to get it figured out.
Having completed it, I may now be the world's top living expert...
I'll just mention a few things that might be useful.
1) I bought supplies from Fred Lohman in Oregon and was happy with prompt delivery of expected items.
2) I found pictures more useful than stopping and starting videos. I looked at this one carefully among others:
https://www.sword-buyers-guide.com/tsukamaki.html
3) Some keys for me were to make sure you are clear which end is which and which side is which. (there are the ura and omote sides and if you have rayskin might relate to where you place the seam)
4) Figure out the menuki placement. Some people seem to just put them in the middle, but the best info I found places them near the guard on the omote side and near the kashira on the ura side.
5) Decide about making all of the hishigame folded paper pieces. Again, some people seem to leave them out.
6) Some tutorials use thin double sided tape along the sides. This can help keeping it from unraveling as you go.
7) Be sure to alternate which side passes on top at the intersections. This seems to be one of the first things people look for.
8) As tedious as it is, I suggest doing your best, most careful and complete job, and then undo it and start again.
I was just happy to be done, but now see small variations in the diamond windows that I wish were better.
In fact I was looking closely at Stuart Branson's WIP:
https://www.bladeforums.com/threads/my-first-sword-o-wakizashi-wip.871406/
When he first wraps the handle the diamonds don't look perfectly consistent. He redid the wrap because he wasn't happy with the handle thickness...sure enough on a second pass the diamonds look perfect.
