I pull the cam out(and install it) fully assembled. I loosen up the adjustment fully on the rockers, take out the cam retaining plate, take out the intake rocker, spin the cam over to were you can get the exhaust rocker out and slide the cam out. Reverse the procedure to install.
I dont take the decompression parts off until the cam is out and then swap it over to the new cam and then put the new cam in.