Outer Limits 4x4 Board

I have some oil leaking and believe its the rear main, so i may aswell do the clutch all in one go.
How big of a job is the rear main seal? Can i do it myself? (mechanically minded and have ample tools)
I have a full manual on CD but my CD drive has shat the bed.

really easy mate they go ask to have a look at on in the parts shop youll get the jist.

I had never done one till recently, a 99 GU TD42 and seal came mounted in the appropriate alloy plate that bolted to back of block, a bit pricey but easy to install.

Tops, cheers fellas