Three months in is actually when this stuff solidifies into a pattern, so you're catching it at the right moment. I had someone request "one more small adjustment" on a project, then three more after that, and by the time I finally said anything I was already annoyed - which made the conversation awkward instead of professional. The trick is to send a brief email before the next revision request lands, something like "I want to make sure we're aligned on scope going forward - the last few rounds have included work outside our original agreement, and I can't keep absorbing those without adjusting the timeline or fee." Frame it as clarifying expectations, not complaining. Most clients actually respect this because it shows you're organized and serious about your work; the ones who push back hard on boundaries were probably going to be difficult anyway.