I use a floor jack with the top plate removed (too tall) and I put a rod in the saddle hole of the jack that keeps the deck from slipping out from under the jack while it is raising up. Also, I use a 4x4 or a 2x4 piece of wood that I slide between the deck and the mower. Then, or course, I put a jack stand under each side of the deck (being careful to not block the blade rotation), and remove the jack. By using an air wrench, you don't need to block the blade to remove, but it is always advisable, when installing, to always check the blade tightness with a torque wrench or a long box wrench and the use of a wood block. Also, with the wood block between the deck and the belly of the mower, you can easily remove the belt from 1 pulley to allow the blades to turn freely to check level of blade tip heights.