Blades

Lift the front of the mower, crawl under deck, loosen blade bolts... replace with new or sharpen old, and assemble in reverse order? I don't think those blades are timed. If your belt is cogged, they could be timed.
 
With a reasonable impact wrench, you probably won't have to brace the blade. Otherwise, a 2x4 or blade clamp.
 
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