Schiphol is a single-terminal airport, which makes assisted transfers relatively simple: everything is under one roof. If assistance is booked for both flights (book the whole journey in one reservation where possible), an assistant collects you at the arrival gate and brings you to the departure gate of your connection, including any transfer security or passport checks. Plan a generous connection time; ask your airline what minimum connecting time applies for assisted passengers.
Warn the crew before landing that you have a short assisted connection; they can inform the ground staff so assistance is ready at the door. See the assistance overview for how the service works.