Thanks for that, druth!
I had originally been imagining using prewaxed strips, and felt I wouldn't be able to cut the correct shape freehand, so that's what had been putting me off DIY. 'Shapes' sounds like a great in-between option. I'm not sure if it would work on mine—I have weird brows that want me to leave the outer ends wider than the inner, which most estheticians and this kit don't seem to want—but I might well do an experiment with Shapes after I use up this box.
I'm just so excited to finally be saving the time and money on this! DIY also means I'm "allowed" to do it more often, which would be ideal to me.