picky/choosy/be particular about ...　～にこだわりをもっている　～にうるさい

picky eater　好き嫌いが多い（pickyは食べ物によく使われる）

He is such a picky eater/guy. 

She is so picky.  

picky about...  ...にこだわる

I'm picky about shoes.

Stop being so picky.

be particular about

He is particular about his suit.

She is very particular about time/small things.

I'm not particular about anything. 特にこだわりはありません。

おもいきって～した　go ahead and ...　aheadで前に出て思い切った感が出る I went ahead and ask her.

どうでしたか？ How did it go?

失敗しちゃった！（カジュアル） I blew it! 　blowﾌﾞﾛｳ 吹く、吹き飛ばす-blewﾌﾞﾙｰ　-blown