Have you thought it through?Work as an assistant is no picnic.
你想明白了嗎？助理的工作可不簡單。
I know.But I would like to challenge myself.
我明白，但是我還是想挑戰一下自己。
How about I go for an assistant position?
我去應聘助理怎么樣？
Well,work as an assistant is no picnic.
嗯，助理的工作可不簡單。

精講部分
Work as an assistant is no picnic.
Picnic是“野餐”之意，如go for a picnic就是“去野餐”?？谡Z中picnic常作“輕松而愉快的事，愉快的經歷”講，所以be no picnic就是“一點也不輕松”，而be not a picnic意為“不輕松，不容易”，前者的強調意味要強很多。與其相反的表達表示我們都熟悉的:a piece of cake,小菜一碟。當然，我們也可以用常用的It's not an easy job.來表達這份工作不簡單。