"After the incident at the last space station stop I decided I needed another option in case a similar situation arises again." It would take time for Vegeta to get comfortable with using any weapon, however Trunks was a good teacher, and knew his father's temper well for when it snapped in irritation.

However... Vegeta struggles with a way to answer Yondu's question, his pride not allowing him to admit he isn't instantly an expert at it. Logically he knows that is not possible... but he's spent so much of his time training, perfecting what he was capable of doing, that to start from step one was difficult for him. "I'm... learning." That answer having a bit of a snap to it.