Howdy, Captains Call is fairly easy to install.  You only have to cut the holes, install the thru-hulls, connect the hoses and wire it all up.
Not a big deal.  It's fairly expensive to buy new (look on ebay for a used set up to find it for less)
Never-the-less it's pretty expensive.  You won't get much if any performance increase and your passengers will always be telling you to "SWITCH IT BACK!  SWITCH IT BACK!" 
 When I pulled the OMC 460 and replaced it with the Merc 454, I didn't re-install the CC.
I have it in a box now.....I still haven't decided if I am ever going to use it....If I did not have it I wouldn't go out and buy one though.
Regards, 
Rick