dive in with both feet
To begin or undertake something quickly, enthusiastically, and without trepidation. I know you're nervous about starting school, but you just need to dive in with both feet and do your best! Instead of sitting around and talking about it, let's just dive in with both feet and start putting this thing together. I have to give something a lot of thought first—I'm not one to just dive in with both feet, you know?
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.