How do I prepare the oven before installation?

Remove any remaining packaging and discard it. Remove racks, accessories, and oven door(s) and set them aside (see Use and Care Manual for proper door removal). DO NOT lift the oven by door handles. Place the oven in front of the cabinets where it will be installed, resting on a jack or sturdy support so it aligns with the cabinet cutout.

From the official Bosch HBL503 500 Series Single Wall Oven manual, page 4

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