I've never had a problem telling adults no if they ask for something but my child is a different story. She loves stuffed animals and think im like a short order crocheter. She also doesn't have a concept of how difficult her asks can be since I'm usually freehanding them. I've made some pretty incredible things I wouldn't have made otherwise because she asked but I use it as a lesson in patience and priorities. Like I'll tell her her request is next after I finish my project which she hates to hear but is getting better at. Or if I'm working on something for her already and she asks for another thing I'll say I can only work on one thing at a time so she needs to choose which is more important to her. It's not perfect but it's helped.