Get into your stride
Definition 1 of 2
Pro Tip 1/3Confidence Growth
Used when someone becomes more assured in their actions over time. 
Once she understood the software, she got into her stride and finished the project quickly.
Pro Tip 2/3Overcoming Awkwardness
Implies an initial period of adjustment before becoming proficient. 
He stumbled at first, but once he got into his stride, he became a great speaker.
Pro Tip 3/3Metaphorical Movement
Though it suggests walking, it's used metaphorically for non-physical activities too. 
It took me a week, but I've finally got into my stride with this research project.