I cover the tail with glue and inside the pocket wiping it around with a brush. Then carefully tap the tails into the pockets with a rubber mallet. Then I clamp each location to keep it from moving and let it dry.

The next day I use pocket screws to attach some rails in the back. I use these because they are a lot quicker and they will never be seen.

Now I have the case completed and can work on the trim and drawers.