turn over a new leaf, To start behaving in a better way or to make a fresh start in your life., the tools of the trade, The specific skills, equipment, or knowledge you need to do a particular job or activity effectively., stick to your guns, To refuse to change your ideas or beliefs, even when other people are trying to persuade you that you are wrong., reinvent the wheel, To waste time and effort trying to create something that has already been created or solved effectively by someone else., know sth inside out , To know everything about a subject; to have a complete and thorough understanding of something., have a change of heart, To change your opinion or the way you feel about something., change your tune, To change your opinion or the way you talk about something, usually because your situation has changed or you want to gain an advantage., break the mould, To do something in a completely new and original way that is different from what has been done before..

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