The way to success

the dizzy heights of sth (humorous)
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a very important position:
E.g. Do you think Tess will reach the dizzy heights of Senior Editor before she's 30?

line manager - Your line manager is the person at work who is in charge of your department, group, or project.

AGAINST ALL THE ODDS
against (all) the odds/ against all odds. If you do or achieve something against (all) the odds (against all odds), you do or achieve it although there were a lot of problems and you were not likely to succeed. Ex.: Against all the odds, he recovered.

daunting (adj.) If something is daunting, it makes you worried because it is difficult or frightening.
daunted (adj.) - feeling afraid or worried. Ex.: He was a bit daunted by the prospect of meeting her parents

A feather in one's cap - an achievement to be proud of.
Eg: It's a real feather in our cap to be playing in the state championship.

Come out with flying colours
come out/pass with flying colors = to achieve a great success
The image is from the days of sailing ships returning from a successful sea battle flying their flags, known as colors

Why I find The Prospect Of A Labour Victory Terrifying

High-flying
Very successful and determined to achieve more things
A high- flying banker
We are under constant pressure to look good, bring up perfect families and have high-flying careers
I didn't plan to have a high-flying job and a large family

High-flying graduates