I screw a field point into the insert, and hold the field point with pliers while I lightly heat the insert with a propane torch, and dab on a very small amount of the hot melt glue that is used to mount inserts in aluminum shafts. The insert will slide into the shaft while it is still hot. If some glue squeezes out, let it cool for about a minute that then peel it off with your fingers.
To remove the insert, hold the tip in boiling water for about 15 seconds, and pull on the field point with pliers. Usually there is already enough glue and I don't reapply glue to the insert when I reinstall it on my bare shaft.
To install an insert for the nock, it is convenient to make a tool by pushing a field point backwards into an aluminum arrow shaft that is big enough in diameter to accept the point, leaving the threads of the point sticking out the back. You cut the shaft off so it is about 6-8" long. Drill through the shaft and the point and secure the point to the shaft with a screw. When you want to install a nock insert, you can screw it onto your tool, heat it in the propane flame, dab on glue, and then push it into the arrow shaft.