I've only built a couple of bows, so I'm still learning my "tricks". I doubt it's a new technique, but here goes. I have a quick adjust woodworkers vise on my bench. My tiller tree is on the wall behind the bench and when I need to mark a spot or use a tiller gizmo, I just bring the rope around the corner of my bench and then stuff the rope into the vise. A quick bump with my hip closes the vise, and then I just need to do a quarter turn to lock the rope down. Might replace it with a jam cleat at some point. The other thing I do which I was taught, is when you make an adjustment to your tiller, remove all of the rasp marks (I use a cabinet scraper) before moving on. That really slows me down and forces me to really look and analyze the area I'm working. With time and experience I'm sure I will be able to skip that or not get rid of every mark. I certainly agree with those that say slow down and be patient, but don't be too afraid to make a bit of kindling either. I love watching newbies work at something I know something about because nobody ever told them "you can't do" that or "that won't work". Amazing what you can learn from them.
Swamp