Excel Formulas, Functions & Secure Sheet Editing

I'm looking for an experienced Excel specialist to assist with unlocking a Profit or Loss statement sheet, editing it, and re-locking it with a new security code. Confidentiality is critical since the sheet contains sensitive accounts data. The freelancer must:

- Unlock the existing Excel sheet securely.
- Make necessary edits as per requirements.
- Lock the Excel file again with a strong, secure password.
- Ensure all functions and calculations are accurate after making changes.

Key skills required:
- Expertise in Excel formulas and functions
- Knowledge of sheet protection and security features
- Attention to detail to ensure error-free work
- Commitment to confidentiality

If you have the skills and a proven track record of working securely with sensitive data, I'd love your help!