Speaking of wrong lines of work, to join the ranks of the Christian priesthood in this day and age would be a very stupid mistake. Don't even try to make me laugh with claims of service to God. The contemporary church has no such purpose. Protect the flock from evil and discourage them from sin? Forget "go and sin no more." The clergy's rule of the day is "come on in and have a good time."
Now, don't misunderstand—I'm not saying that going in there will just transform you like magic into some cartoonish villain waving a mini "Christian America" flag in one hand and swiping through a same-sex hookup app on your smartphone in the other. But you'd be entering a nest of libertine vipers, not a house of God.
Then there's corruption through politics. One thing the clergymen and theologians of old were right to say was to keep away from "courtly" life and its influence. The American Evangelical movement sold its soul to partisan politics decades ago. "Be not of this world," my ass—just look at conservative and liberal Christianity here in the States. There's a world of difference between supporting the Civil Rights movement in the '60s and labeling God a member of a given political party. The emphasis must be on humility and hope, not pride and fear.
If you want to serve the Lord in the church, go to a monastery. If that life's not for you, then learn a trade. The world, or at least the U.S., needs skilled workers more than it does priests.
Besides, what secular line of work could be more Christlike than humble tradesmanship?