This part of learning a skill such as catching cannot be overlooked. Another drill you should include in our practices is pass in-pass out and reposition. Many coaches spend so much time emphasizing catch and make your post move that a player becomes a conditioned black hole. The consequence of this is that defensive teams know this and collapse more quickly. If you player is comfortable and able to execute the timing and passing in and out of the ball to the perimeter it creates more space and less pressure on post passes.
Less pressure means a more confident and relaxed catcher.
When you are working with blocked catching drills you should begin with a specific pass by passing to an exact location. Then as the catcher becomes more confident slightly vary the exact location. Defensive pressure drills help the player get use to changes in defensive force against their body in addition to changes in the location, speed, and variance of passes. Work with defensive pressure the same way. First with blocked drills, e.g., pressure only high side, then low, then behind, etc.