Engine Mount Replacement

[mightyatom]

Hi All,
The engine mounts in my 1972 Chevy C10 (350ci) look to be very warn and one looks like it is badly split resulting in a lot of engine movement when cold. I would like to replace the engine mounts and read in a couple of post that this can be done without removing the engine. I took a look a the mounts from underneath and there is not much room to move so I just wanted to check if anyone has done this before. My shop manual is has been ordered which may answer these questions but until then, any help would be appreciated answering the following:

1. Procedure to replace engine mounts.
2. Any tips/suggestions
3. Any specific tools that will make it easier.

Many Thanks
Jay
(1972 Chevy C10 350ci)