How does one discover the call?
I get that question a lot. In many and varied ways. There are as many ways to find a vocation as there are people to find them. It makes sense, God created each of us unique and has a particular call for every life.
The first and most important thing is prayer. Talk to the Lord. Ask him what he wants. It can be in the presence of the Blessed Sacrament. I always like that - you are talking to him face to face and he can't get away. But walking...or in your room...or at any quiet time. I had one girl tell me she prays in the shower - it's the only time she can get away from her myriad siblings.
Whenever. Wherever. We know, by faith, that he is always present. It takes us making the decision to be present to him. He did say - no, he promised - "Ask and you shall receive." He is not going to back out on it.