That is why I had to make a pattern!! I would never had tried it without one. Punching all those holes and then lining them up to barge them together was a challenge, as well. But I finally came up with a solution that made that job very easy and I had no problems with any holes not being aligned. I just had to repurpose a few tools.
On another note, which I need to start a conversation about, I am not happy with any of my leather punches. There must be quality leather punches out there somewhere!!