For example, if you're starting a new job, you might need some time to "get into the swing of things" before you fully understand your responsibilities and feel comfortable in your role. Similarly, if you're learning a new language, you might need to practice for a while before you "get into the swing of things" and start to feel more confident in your abilities.
The phrase "get into the swing of things" suggests that there's a certain rhythm or flow to an activity or situation, and that it takes some practice or experience to become attuned to that rhythm and perform the activity smoothly and effectively. It's often used in a positive way, as it implies a sense of progress and improvement over time.