I learned how to cut a perfect stencil after a lot of trial and error. Even I still make mistakes sometimes, it’s not an exact art. You’ll find yourself getting overconfident and then BAM, you’ve gone over the line.
Use my tips and you’ll get an almost perfect cut each time. Test it out on a printed coloring sheet, one with heaps of patterns like this Zentangle print from Riot Art & Craft, and you'll end up with a cool cutout print that you can display with washi tape on a coloured board or wall.
Use long, sweeping cuts: This is my number one trick. It can be daunting at first, but you just have to ready yourself then go for it. Cut each line in one sweeping cut to get the smoothest line. (Unless it’s a circle, then you’ll want to cut two half-moons.)
If you don't believe me, here's a video of me cutting the Zentangle print:
The finished product: