Clutch replacement/Rear main seal

I'm new here and I have recently picked up a 74 duster. After getting it home and playing around with it a bit the clutch started slipping so I start doing some investigating. It appears the rear main seal went:banghead: (I'm not surprised as it was in storage for 12 years and is a 40 year old car). I called up a local shop yesterday and they said I was looking at 12-15 hours of labor for the repair and the dollar signs started adding up in my head.

Now, I can get this done with just the cost of parts (and borrowing or renting an engine hoist) my self and it will be probably a quarter of what the shop will charge me and it will give me some good quality time with my new project. I would also like to paint the engine bay while the engine is out so this is a huge plus as well. While I am no stranger to mechanics and have always done my own work, I have never pulled an engine and replaced a clutch or rear main seal.

I'm hoping to get a little more insight on this project from people who have possibly done it them self. Also, do you guys have any recommendations on manuals I can get to help me with the project? I looked up a haynes manual for the car but it is very "generic" and does something like "plymouth cars 72'-89'" so I don't see it being all that much help to me.

Thanks in advance.

ETA: I have a /6 engine with a 3 speed transmission.