If you are a residential recipient a lift gate should be included on your order. A lift gate will drop the heavy pallets down out of the truck bed.
From there the drive will use a hand operated pallet jack to move the product to a location suitable for storage, you can direct the delivery personal if you have a preferred location.
If a lift gate is not included in the shipping, the truck will arrive and you, as the customer, are expected to either have a fork lift to get the parts off the truck OR unpack the parts by hand. This is best left to installer who has experience with freight shipments.
Make sure to inspect the shipment and write on the delivery receipt anything that might be amiss, be it potential damage or missing equipment.