I brought a part time person on last Fall. I would suggest a background check. I have her working on the private pay clients with prior approval by them. I have not yet used her for any fiduciary type clients where I am appointed. However, she just picked up a trustee role herself. She is an employee and being paid hourly. We have talked about finders fees to further incent her.
I currently have my client files on two machines – one where we can both remote in and one where only I can access. I have been able to also segregate passwords through lastpass family version. We also have a shared emailbox so both of us see everything that would be coming to her. And we have a bill and todo tracking system that allows me to see tasks and bills company wide and she can just see hers.