Well basically you need to remove the transmission and flexplate (or flywheel). If you have a manual this is a good time to install a new clutch and resurfaced flywheel.
If you have the trans out, I'd go ahead and install new motor mounts, new oil pump, and new oil pan gasket...you are just in need of a few hours more work for all that stuff.
In the driveway, I'd budget most of a day and get a buddy to help.
Hope that helps some...
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