Who are you calling ‘feral’?

I’ve sent my novel off for professional copy-editing! (Which means it’s nearly there, or closer than before.) Here is Nemu admiring the nearly-finished MS (or perhaps she looks a bit disgruntled that I’m implying that she’s feral!.)
Printing and scribbling on a hardcopy works for me, although I’ve heard stories that people can copyedit their own work by changing the font on their device. (I’ve heard of changing the font to comic sans works, or even making it really large.)
What works for you?