Urgent Excel VBA Automation

I have an existing workbook that’s crying out for full automation. Everything the file does now—data crunching, formatting, report prep—needs to run end-to-end the moment the file opens, with zero user input. No web scrapes or database calls are involved; every source the macros need is already inside the workbook or on additional sheets I will supply.

Here’s what I expect from you:
• A clean, well-structured VBA module (or modules) that handles the entire workflow automatically on Workbook_Open or a similar event.
• Solid error handling so the process can finish—or exit gracefully—without pausing for prompts.
• Clear in-code comments plus a brief hand-over note so I can maintain or extend the macros later.

If you can jump in immediately and deliver a rock-solid, no-click solution, let’s talk.