上(咗，緊)手 get(got, getting) hang of it

informal. Idiom

“to learn the skills necessary to do something proficiently” M Webster.

“If you get the hang of something such as a skill or activity, you begin to understand or realize how to do it.: It’s a bit tricky at first until you get the hang of it”.

For examples:

"It's really fun to ride a tandem bicycle once you get the hang of it" Cambridge Dictionary.

"Don't worry - you'll soon get the hang of it" Cambridge Dictionary.