(PW) adapt or adjust to a new environment
After working two weeks in the new department, I finally got into the swing of things.
(goenglish)
Get Into The Swing Of Things ( feel comfortable participating in what is going on ... )
(free)
be in full swing
to be going ahead, or continuing, busily or vigorously
The work was in full swing.
get into the swing (of things)
go with a swing
(of an organized event etc) to proceed or go easily and successfully.
(dictionary)
get into the swing of things
Become active, make progress. For example, She only started work last week, but she quickly got into the swing of things . [Late 1800s]