in at the deep end
Definition from Wiktionary, the free dictionary
(thrown) in at the deep end
- To be put into a complex situation (especially work-related) without when lacking experience in the field; especially in the case of a new job. Derived from the slope in a swimming pool which is shallow at one side, for beginners, and has a deeper section which is designed for more experienced swimmers.
- Also 'jump in at the deep end' - to deliberately tackle a difficult area; to take the bull by the horns