How hard would it be...

I want to do a 'simple' cam swap, but don't want to pull the engine out of the car, can this be done? Will have to change valve springs, too, and while I'm at it I will install these ohio crankshaft roller rockers, they are adjustable, obviously, but how do you set lash on hydraulic lifters? Gosh, I feel really ignorant right now! :scratch: lol I have alot to learn!