​What business task did you underestimate that now takes up all your time?

I started a small service business last year and the biggest shock has been how much time I spend on the phone just chasing invoices and payment confirmations. I thought I would spend my days doing the actual work but instead I feel like an amateur debt collector half the time. It is exhausting and it really kills the creative energy I need for the projects.

I am interested to know what yours is. Is it the constant emails the scheduling or maybe just trying to keep your records straight. What is the one thing you eventually had to fix just to stay sane.