For me, its always been invoicing.
My mother owns a computer repair store and in my teens, I was responsible for invoicing which had to be met with perfection. Had to capitalize words a certain way, word things a certain way.
I will spend so much time reviewing and perfecting invoicing.
When I did some freelancing, the most nerve-wracking part was telling someone non-technical how much the project was going to cost.
Lose a customer for a poorly developed project
The amount of advice and suggestions related to getting started can be... just as overwhelming as trying to figure out where to get started.