I have a 1994 E320 that appears to have a leak from behind the crankshaft pulley so I suspect the front seal. How easy is it ti remove the pulley etc and get the seal out?

Here's a link to how the factory does the front seal:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/104/01-2140.pdf

You will have to judge for yourself how easy it is to do, as only you know your abilities.

Remove crank pully with key straight up as key can easily slip into oil pan during removal/ installation, easy job with the right tools

It appears to be the Crankshaft front seal

thanks