Look at @bailey.miles' buddy cashing in on repairs. What's your biggest fear about turning pro, like getting overwhelmed by demand?

Reminds me of when I tried to apply a screen protector without any bubbles. Followed all the tutorials, used a credit card to smooth it out, but still ended up with a tiny speck of dust underneath. Had to peel it off and start over, wasting that expensive film. Now I do it in the bathroom after a hot shower for the steam to settle particles. What's your worst DIY disaster?