I think the heat generated in the engine bay plays a role in the front mount deterioration. As for "how hard" , if you have good patience, it's not too bad. There are a couple nuts that can be a challenge, especially if the entire bolt shaft turns with the nut rather than the nut breaking free. I HIGHLY recommend, looking in the Bentley manual and marking the mount with a permanent marker for direction and placement. The mount can be reassembled wrong, (yeah I proved this the hard way and made the job two hours longer) oops.
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