Having been on the "Other Side' is probably one of the best things that could happen. You will be amazed by your insight.
Use your skills to try and make the process transparent to the user - they do their job and the systems provide the compliance. That way, they will be responsible for (selling/processing/customers, etc) and based on their input, the system will lead them down the road to correctness.
Integrity. With it, nothing else matters. Without it, nothing else matters.