Lien Resolution specifics, US based

Hi there, I'm working with a friend to start a small lien resolution company and was wondering if there'd be any way for people on here to answer a few of my questions.

We understand the process of it but were just hoping to get some further information:

1. What are some unexpected/weird challenges that arise?

2. How do you make lien holders respond productively/efficiently?

Thanks for your answers, and if this gets deleted can someone reroute me where I can find answers.