I’m not sure if there’s any set way of doing this. For me, at confirmation, we were asked to choose a patron. I chose St. Francis of Assisi because he liked animals. (I was 12 or 13 at confirmation.)
I have considered several my patrons, anyway those I regularly ask for help such as St. Anthony (finding stuff), St. Jude (difficult cases), St. Joseph (the workman-I have a blessed medal of his in my work area) for example.
I’ve primarily have considered St. Francis my patron due to my confirmation and adding his name to mine. This was in my cradle Catholic life.
Now, in my reversion, I’m a strong devotee to St. Philomena. This came about in a surprising way to me. I visited a shrine of hers last year which is the first I ever heard of her. I read about her, her powerful miracles and intercessions, and asked for her prayers there. Gradually but not long, she began answering my prayers, even if you’ll permit me to be a bit mystical here, manifesting herself to me. A few months after the shrine visit, I was reading about her and she “showed up”. I couldn’t see her with my physical eyes but her presence was so real it was incredible.
Since then, she’s become my primary intercessor and my patroness as deeply (if not more) than St. Francis. I never knew it was even possible to have such a real relationship with a saint until I met her. With St. Philomena, it’s more SHE chose me!
So, I consider St. Francis and St. Philomena my main patrons each from both of my Catholic “lives”.
I also noticed the difference between a saint for me like St. Philomena and others whom I’ve also read about and even thought would become my patrons, yet none have been as real to me as she has. I think maybe God matches us with particular saints.
Don’t know if any of this helps others, but that’s my patron story!
Thanks,
HA