If epoxied in, I've taken out with a lot of heat. My preference is to install with hot melt glue (Quick Stick from Kustom King) and I've never had an insert failure with it. To remove, insert a field point most of the way into the arrow and heat it with a torch. Keep checking from time to time with a pair of pliers to see if you can pull the insert out with the field point. If not heat some more. It takes a good amount of heating to get the epoxied inserts out and I don't know if that compromises the shaft, but I have done that and reused the arrows. As I mentioned above, it's better to install with hot melt from the get go.