Do you plan station lockers before the trip or decide after arrival?

A luggage planning question about station locker size, payment, location, and fallback options.

Station lockers are useful until every large one is full or the payment method is wrong. I like to mark the locker area, size risk, accepted payment, access hours, and a fallback such as hotel bag drop or a smaller nearby station. But planning every locker in advance can also make a short trip feel too rigid. For luggage-heavy travel days, do you plan station lockers before arrival, or decide once you see the station?