Nothing special about steel shaft removal. Heat it up gradually make sure the heat distribute evenly. Remove the ferrule ( easier to heat up close the the top of the neck ), heat it up on both sides of the hosel give it a rest so the heat could conduct to all parts of the inner wall. Hold the head with heat proof material and twist the shaft with another hand ( best leave the old grip on ). If the epoxy is broken, it'll move. Apply more heat if needed.
Graphite shaft needs shaft extractor to avoid damaging the shaft after heating up. Trick is to use proper tool and heat up the hosel gradually and evenly. Always give it a little time for the heat to be conducted to the inner wall of the hosel. Mini Propane torch is the best, avoid prolonged direct heat in any single spot , the finishing might brown or crack.
It really is not a rocket science to remove golf shafts with proper tools and a little practice.
Matching the shaft with individual golfers at a specific time is science and art combined. I'd swear some golfers will have a different golf swing every month.