get into stride
get into (one's) stride
To become comfortable with something. It took a few weeks, but I think I've finally gotten into my stride at my new job. I know that Rob has been struggling a bit since he joined the team, but I'm confident that he'll get into his stride soon enough.
get into one's stride
1. Lit. [for a runner] to reach a comfortable and efficient pace. I got into my stride right away, and that helped win the race. She never got into her stride, and that's why she lost.
2. Fig. to reach one's most efficient and productive rate of doing something. When I get into my stride, I'll be more efficient. Amy will be more efficient when she gets into her stride.