But yes....
Assuming it’s a Sensenich fixed and a Saber extension, you get out a large persuader, a large diameter drift, and some lumber to secure the prop, and you apply persuasion to the two dowels to separate the prop from the extension. It’s not as bad as it sounds. And if that’s a Sensenich spinner, don’t spin it without the dome above about 1600 RPM, or the backside fairing ears will Bend out and you’ll get to replace that too. Been there, done that.
I used a short handled four pound sledge, my 20oz dead blow didn’t budge it. The four pounder made it easy, and I really didn’t have to swing hard. Take your time, safety glasses and gloves and a helper are highly recommended.
You should mark it such that you reassemble the parts with the same relationship to each other. Also, be sure the mating surfaces are clean when reassembling or torquing and tracking may be off.