Choosing a spiritual director who's a good fit isn't a simple endeavor--not all spiritual directors are good for all people. Part of discerning who might be a good fit is figuring out whether the spiritual director you meet with is the sort of person you can imagine yourself either wanting to be or called to be in some respect. My spiritual director is a female Episcopal deacon, and I have long felt called to ordained life as a female, even though my own female identity has prevented me from pursuing ordained life for my entire life as a Roman Catholic.
Meeting with someone who shares (or who can adapt to) your communication style helps as well. If you're forthright and want to hash things out in an objective way while your spiritual director is highly sentimental, you may feel as though you're talking past your director. Compatible communication styles help bring forth the substance of the conversation rather than serving as a barrier to it.
That being said, meeting with someone who isn't exactly like you can sometimes be the most helpful thing of all--someone who is older (or younger), someone who's from a different faith or spiritual tradition, or someone who has had major life experiences that differ from your own may be able to lend a fresh perspective to your context.
For me, the most important aspect of a spiritual director is always my gut feeling about that person: Is this someone I trust? Faith and trust are of the same root, and one can hardly develop one's faith with another if one doesn't deeply trust that other from the very beginning.
My spiritual director shared a poem with me that I had never heard before as we began our first conversation together, and it seems to me to be a perfect encapsulation of what one experiences when one is ready for a spiritual director.
In out of the way places of the heart
Where your thoughts never think to wander
This beginning has been quietly forming
Waiting until you were ready to emerge.
For a long time it has watched your desire
Feeling the emptiness grow inside you
Noticing how you willed yourself on
Still unable to leave what you had outgrown.
It watched you play with the seduction of safety
And the grey promises that sameness whispered
Heard the waves of turmoil rise and relent
Wondered would you always live like this.
Then the delight, when your courage kindled,
And out you stepped onto new ground,
Your eyes young again with energy and dream
A path of plenitude opening before you.
Though your destination is not clear
You can trust the promise of this opening;
Unfurl yourself into the grace of beginning
That is one with your life’s desire.
Awaken your spirit to adventure
Hold nothing back, learn to find ease in risk
Soon you will be home in a new rhythm
For your soul senses the world that awaits you.