Jordan Peterson on writing your self-narrative:
“Write the things so that you have written it for you, and then take everything out you’re not comfortable sharing with other people”
This reasoning can be transposed to the CV and your cover letter.
Write what matters to you: what you’ve done, your tasks, your accomplishments.
Then suppress everything that do not add value to your profile / is not relevant to the position you’re applying for.
That’s a solid first step for your CV.
Source: Lecture: Map of Meaning 2017, Lesson 1, 2:26:00