not too hard to do. i had an s 28 a long time ago that had a a 4,and my cat 27 i have now does.i didnt take it out of the s 28,but did my cat.use the winches,both and run a rope under the moter,pull with both,engine will lift,slide it onto sole.then tie it again and winch it up through companionway into cockpit,then over side.moter weighs 350 lbs,i did it by myself,and also did it with a yanmar 3 gm 30 alone.i wont lie to u its a job,but just dont try to move the engine yourself,i mean with ur own strength,use ur winches.whats up with the a 4, man they are great engines