Custom order requests — a buyer asking for a name added, a color changed, or a completely bespoke design — show up fairly often once a shop gets any real traffic, and they can be either a nice revenue boost or a quiet drain on your time, depending mostly on how you structure the "yes" rather than whether you say yes at all.
The first useful move is deciding in advance what kinds of customization you're actually willing to offer as a standard, repeatable option — adding a name or short text to an existing design template, for instance, is something you can systemize (a listing variant with a personalization field) rather than treating as a fully bespoke one-off request every single time. This is genuinely different, time-wise, from an entirely new custom design built from scratch per request.
For requests that are genuinely bespoke — a completely new design concept, not a variation of something you already have — it's worth pricing this meaningfully higher than your standard listings, reflecting the real additional time involved, rather than treating custom work as a small add-on fee. A common mistake is underpricing custom work because it feels like "just a small tweak," when in practice a fully custom design can take as long as several standard designs combined.
Setting a clear, upfront expectation about turnaround time for custom work specifically (often longer than your standard processing time, since it requires actual new creative work before production even starts) prevents the most common source of custom-order frustration — a customer expecting the same fast turnaround as a standard listing, not realizing custom work inherently takes longer.
It's also completely reasonable to decline custom requests that fall outside what you're set up to do well — a request wildly outside your usual style, or one that would require software or skills you don't have, is better turned down clearly and politely than accepted and delivered poorly. A short, friendly decline ("that's a bit outside what I specialize in, but here's someone/something that might be a better fit") maintains goodwill far better than accepting a request you're not well-positioned to deliver.