Crankshaft Oil Leak (I think)

[Ramblin]

As a fairly new owner of an 83 300CD (last year) and contributor to this forum I am finally faced with what I think is a fairly complicated repair on my car...The car is high mileage but had an engine replacement with a great engine (starts great in cold weather) but it is leaking oil near the front of the engine...I assume it is the front crankshaft seal and I am not sure it is that major but it is causing the oil levels to go down. As a fairly anal car owner my thought is to repair this but I believe there must be special tools needed. I consulted the official CD manual but did not find a very detailed description. Anyone in the forum had experience with this repair and offer suggestions..Thanks