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The "trick" if that's what you want to call it is that you get good at taking it off and on after doing it a few times, and everything doesn't have to come off, as long as 100% of the original smog stuff is still there and functional. Big time sink would be changes to the intake, but no way really around that with some designs and swapping can take a lot more time.
Assuming you start with an 87+ the easy thing would be to keep a spare set of brains with factory chips and swap them, like 15 minutes work, or some use a larger capacity Eprom chip that allows switching between different tunes.
Doing an engine swap, with practice, is easy on a weekend remove and install, and another to swap it back, but might leave a bit more knuckle skin on the engine bay. If my cam turns out too lumpy to pass the smog idle test, I may say screw it and do engine swaps.
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