One time my uncle who worked at a large bank suggested I should become a debt collector. He said I had the right personality for the job, which I wasn't sure was a compliment or not. He said many employees at his bank started out in debt collection, then worked their way up to other departments with less stressful workloads. I told him I'd give it a try.
It really wasn't as bad as I thought it would be. Most of my clients agreed to set up a repayment schedule, and I rarely had to send out the repossession team. I can't say I enjoyed being yelled at for ten minutes by irate customers, but I found ways to disconnect emotionally from the situation and just let them vent for a while.