There's more than one way to remove this sprocket. Here is my way to make it easy. Remove the cover, bend the safety washer tab away with a wide blade punch or screwdriver, and then shove a rod/or old screwdriver shaft between the rear sprocket teeth and chain as you rotate the wheel forward which will jam it. Keep it tight while you use an impact wench to remove the primary nut. You won't damage anything at this point because you are changing everything as a set anyway.