Does anyone use Family Historian?

[ElizabethHerts]

I have imported my large tree and I'm very pleased with the program.

However, I'm trying to follow their advice for repositories and sources and I'm experimenting using my grandmother's birth certificate.

The problem is that most of the information on the certificate is already entered on my tree and the instructions are mainly for adding information from scratch. I'm getting more and more confused! I need to add the occupation of my great-grandfather at her birth and other details, but I'm getting bogged down now.