The engine on my 1994 Ford Taurus GL is leaking oil and there's a blue seal that's slid out of it's seat and is just chilling there letting oil leak through. My motorcycle instructor told me that it's the Front Harmonic Balancer Seal AKA the Front Crankshaft seal. I bought the seal, but I don't trust the Automotive class in my college to repair it for me because they've screwed everything else they've done on that car before. I tried to look up the seal in the service manual I have for the Taurus, but it doesn't say anything about a Harmonic Balancer. Is it hard to replace? Could I do it on my own in my driveway while I'm changing my oil? Or should I just break down and hope to God that Baran's Automotive class doesn't screw up my car again or tell me it's unsafe? Please help!!