Take a leaf from/out of somebody’s book
Definition 1 of 1
Pro Tip 1/3Positive Emulation
Use this phrase when you admire someone's behavior and want to copy it to succeed. 
I'm going to take a leaf out of my teacher's book and start planning my studies better.
Pro Tip 2/3Respectful Recognition
Imply respect for the person you're emulating without sounding envious or jealous. 
She's so efficient with her clients. I'll take a leaf out of her book and organize my schedule similarly.
Pro Tip 3/3Subtle Inspiration
The phrase often hints at subtle inspiration rather than direct copying of someone's actions. 
Our competitor's marketing is effective; let's take a leaf out of their book for our next campaign.