I was a freelance Graphic Designer while working part-time for a decade. Due to irritating clients I wrote into my terms and conditions that disputes resolved with a tutorial PDFs by me will result in an additional charge of $50 to the job.
Client: I need this logo you designed me for my zip seal tea product to be smaller. I don’t want to pay the printer that much.
Me: Did you want to change the materials of the stickers or print direct onto the packet instead of stickers?
Client: No I need the matte stickers I specified. Just make them to size of your thumb instead. I can print that and stick it on to my bags of tea myself (550g and 1kg packets of loose leaf tea).
Me: I would advise against that as the customer will need to squint to see the logo and will not be able to see the logo properly from the aisle.
Client: Why is that? Seems quite logical to me. Why would they squint?
Me: Should I send a PDF tutorial explaining?
Client: Well all right, you seem to not be able to make sense on the matter.
Clearly I needed to take extra steps.
Me : I sent a PDF with pictures I captured of me in supermarket aisles comparing the products I could identify clearly from walking and compared to my thumb size.
Client: Ahhhh, ok well that makes sense. I guess I’ll have to pay for the original size then.
Later, after billing:
Clients wife: My husband wants to know why you have charged him an extra $50 than what was quoted.
I explained the PDF terms and conditions on the contract.
Clients wife: (yelling at her husband while still on the phone to me) She charged you more because you are an IDIOT!
Client’s wife: (to me) Don’t worry I’ll pay you myself.
The client was grumbling and muttering to himself in the background while his wife finalised the payment.