I've done it for a number of years now every season to check things out in the fall and lube the ujoints and splines and check for water in the bellows...I built a stand to hold it and that will save your back because they are heavy--if I recall right yours is a King Cobra cone clutch which is BIG compared to a plain Cobra...so make a stand (take a look in the I/O forum at iboats for some ideas...mine is there.....)
Then see if you can get a manual....best bet is ebay...the basic procedure is
throttle in neutral
put stand under the drive
loosen the 6 nuts that hold it on the pivot housing
remove on nut on the trim ram rod and push the rod through the drive to relase the rams...
them remove the nuts that hold on the drive...
pull back and hope it comes off...(it will if the driveshaft splines are not corroded in the coupler)
now there could be some differences because this procedure is for the plain dog clutch Cobra...
check out this link....does yours look like this?
http://www.dougrussell.com/partscatalog ... ,1586,1587http://www.dougrussell.com/partscatalog ... ,1586,1587this procedure is for the standard Cobra but its probably similar....
http://support.crowleymarine.com/entrie ... ve-removal