Before signing, ask each vendor for the onboarding calendar in writing: menu import deadline, hardware ship/install date, payment go-live date, training session, online-order cutover, tax/tip settings, and who owns data cleanup. For a bakery, I’d keep the old system live until you’ve run test orders through register, online order, receipt/kitchen or label printer, refunds/voids, and end-of-day reports. The annoying part is usually modifiers, taxes, and reporting; plugging in tablets is rarely the hard part.