take the plunge

米国でベストセラーになった近藤麻理恵さんのthe life-changing magic of tidying upを読んでいます。 Keep only those things that speak to your heart.
Then take the plunge and discard all the rest. By doing this, you can reset your life and embark on a new lifestyle.
"plunge" に飛び込む意味があるのを知っています。"take the plunge" は慣用句として覚えた方が良さそうです。"take the plunge" で辞書を見ます。
・Oxford English Dictionary: informal Commit oneself to a course of action about which one is nervous.: I was skeptical at first but I eventually decided to take the plunge.
・American Heritage Dictionary: To begin an unfamiliar venture, especially after hesitating: After a three-year engagement, they're finally taking the plunge.
私も長年使わないのに捨てないで部屋のスペースを占領しているガラクタが幾つもありますが、この本を読んだら "Then take the plunge and discard." できるようになるでしょうか？