Not sure why you're replacing it, but if it hasn't been taken apart recently at the stern end, cleaned and lubed, it is most likely all cruded up with old dried lube. When you pull the cotter key and lift the pin, then take the outer casing nut loose, you'll probably have to give a pretty firm jerk on the casing to get it out of the tube. Pulling it out and cleaning/relubing it that every couple years will keep a steering cable going almost forever.