Very difficult
Getting into corporate aviation is like finding the needle in a haystack.
Most of those hired are women, but they do also hire men.
To be considered you will need to have a few years experience in First Class from one of the top airlines. Singapore, Emirates, Qatar etc...
In addition to this, corporate jet companies rarely have recruitment campaigns. You basically need to know somebody who can recommend you to get in. It is a lot more competitive to get in than even the top airlines.
I wish you the best of luck!