Honestly, I don't think it is. I haven't changed it yet, but it doesn't look to hard. Just get the right tools and definitely a Motorcraft rear main seal. I have heard bad things about using off brand seals
To remove the old seal the only way I've seen is with a couple of old screws or a small pick like from harbor freight.
Just be very careful that you don't scratch the crank as that will cause the new seal to not work properly.
<li> Product Feature:</li> <li> </li> <li>1. APPLICATION: Specially designed for 1993-1997 Aerostar or 1993-2006 Ranger and Explorer with 4.0L V6 engine.</li> <li> 2. FUNCTION: Rear Crankshaft Seal Installer works on crankshaft rear oil seals that come with or without a metal wear sleeve.</li>...