I've only created one other image before, and that one seemed to go pretty smoothly.
Since I started this second project, however, I've found that I can't scale the default line thickness if I'm trying to use the "none" option in the shape dropdown list.
The line defaults to .265, and if I reset the line manually it only affects that stroke, my next line will be right back to .265.
I feel like my first project didn't have that hurdle, I was able to go through that graphic in about a day, just drawing in the lines as thick as I needed to, without any issue.
Is there some setting that I might have inadvertently messed up that would have locked up the adjustment for the "none" shape?