My goal is to show you how I could do the job profitably for you. Part of that will be demonstrating how I can learn quickly and perform accurately. If you'd like, I'd be glad to show how I'd approach an entirely new task, if you will describe what you need done. Then let the manager take it from there. It's all part of doing the job.
Few candidates bother to explain any of that.
They proceed blindly. I would prepare by contacting the vendor of the tools and asking for manuals or information about the tools. Just say you're interviewing for a job using their tools, and that you'd like to prepare adequately. The more you know about the system in advance, the better. You might even ask the manager to loan you the manuals a week or two in advance of the interview.