I got involved in ministry.
It is hard to figure out if you are an athlete while sitting on the bench, and it is hard to get direction into ministry from the classroom or pew, but many times a missionary will fail because he stepped directly from the classroom into the arena before having time to use and prove his abilities, gifts, and preparation.
If the only qualification for ministry was a desire, I would have left years ago, but wisdom says that moving across the world into a foreign land of strange beliefs and culture, trying to persuade men to believe and shape their whole lives around something they have never heard, will pose significant challenges.
And I would be a fool to step out as a novice, alone, into that environment without thorough practical preparation and an assurance from the Lord that has come through killing a few lions and bears.
Facing a Goliath like Thailand is scary to say the least, but the Lord has proven to me that He can use me if I step out on the battlefield.
Do I mean that I am confident that I am always going to be successful? No, but I have learned through many failures and successes, (1) that He can use me, and (2) the ways that I hinder His use of me.
I learned about myself in a real environment. I let some frustrations set in. I found a lot of weaknesses and some strengths, and I know pretty much exactly what I am going to have to fight in myself when I am on the mission field. The same things I fought on this side of the ocean.
So, if you are considering what the Lord would have you to do in ministry, step out, take opportunities and allow him to guide you as you are busy serving.