re: Learning to say no.

You’ve managed it once, Lizzie, now you will find it a wee bit easier each time you feel the need to refuse a request. Good for you.
:D
I am paid for my cakes, but I do cakes for my niece and nephews as birthday presents. They get to choose a theme for their cake, but I keep it to a “normal” size- typically an 8" or 9", and as it’s a gift I get to decide what it will look like.
Special occasions like anniversaries or showers will also usually get a cake or cupcakes, but as it’s a gift from me I don’t feel the need to cater for however many guests may be at the party. And if I have a hectic workload for the week before the party, the cake may not be terribly elaborate.
If my family or friends ask me for a cake or cupcakes, then they get to call the shots the way my other customers do – but they get a discount! :P
And I do enjoy making them, because it’s often an opportunity for me to try a new technique on a cake.
I feel that if you are doing the cakes at no cost to the recipients, then they are gifts and you should be “calling the shots”.

Heaven in paper cups!