Did it with the tool no prob but...
It can be done pretty easily w/o the tool and $12 is a bit much for basically a flat piece of iron with a cup cut in the end, but then again I did it with the tool. Anyway, with the tool, or a screwdriver, pair of nails, etc. - place it between the tube and the slave cylinder input, then pull the tool, etc. back toward the tranny while pushing out on the tube itself with your other hand. Took me about five minutes the first time and it doesn't come smooth, just kind of jerky-like. Did go back in smooth though, just pushed right in and hooked, kind of like an air hose.
Brian