Empty every drawer, including the small ones that are easy to overlook. Remove loose mirrors and shelves only when they are designed to detach safely.
Measure the piece and the path
Record width, depth and height, then measure doorways and stair turns. Mention solid-wood construction, attached mirrors and any damaged joints that could shift during a carry.
Keep the weight predictable
Do not leave books, clothing or personal papers inside. An unexpectedly loaded drawer changes the center of gravity and can slide open while the piece is moving.