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Bill,

It's a pretty straight forward job but does require the engine to be torn down to the basics and not a job I would want to do while the engine is in the car.

First the head, oil pan, valve cover, front and side timing gear covers will need to be removed.

Remove the valve springs, guides and valves. You don't necessarily need to remove the guides and valves but its a good opportunity to clean them up if they would benefit from it.
Turn the engine upside down or use Tom's trick using the wooden clothes pins to hold the lifters up so the cam shaft can be removed.

Then reverse the process starting with installing the new adjustable lifters.

My thought is if you are going this far one really should consider checking the clearances on the rods and mains and replace the rope seals in the oil pan and front timing cover.

Check the valve seats and lap them in as needed.

Dave