get your feet wet
US /ɡɛt jʊər fit wɛt/
UK /ɡɛt jʊər fit wɛt/

1.
to begin to do a new job or activity in order to get some experience
:
•
I'm just starting out in this field, so I'm trying to get my feet wet with some smaller projects.
•
Before taking on a big role, she wanted to get her feet wet as a volunteer.