new to (all (of)) this
Completely inexperienced in some activity, profession, way of life, etc. I'm sorry for being so awkward. This is the first time I've ever been on a date, so I'm new to all of this. They didn't tell me the job entailed accounting work, so I'm a little new to all this. It's his first day working construction, so cut him a little slack—he's new to this.
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