this is what works for me:
1) Find the biggest field point you have and chuck it up in a vice, parallell with the floor.
2) Screw the arrow on the field point, but not all the way, just enough to engage the threads.
3) Using a torch, heat the field point in the vice. Do not get the flame anywhere near the threads. Apply steady pressure by pulling on the arrow at the same time.
4) As soon as the glue gets hot enough, the arrow should slide right off the insert.
The reason I like doing it this way is twofold - first, When the arrow is not totally screwed onto the point, the heat is directed into the center of the insert and not along the entire insert which can damage the carbon shaft (too much heat with the field point screwed completely in can melt the glue between the layers of carbon before it melts the insert glue). Secondly, if you keep pulling steadily, you get just enough heat to the insert to break it loose, without any excess heat and potential shaft damage.
I've pulled many, many inserts like this without any shaft damage. Good luck!