I have good skills in Excel automation and used extensively the macros/VBA to automate:
Data validation in a particular, Data consolidation into sheets, comparing, plugging in default values for few cells,, data camparision using formulas, lookups and bringing up summaries.
Based on the data needed would implement a swapping, or even automate by using macros.
Would work with dedication to complete the task.
Day 1 will understand more about the task in hand and start off
Day 2 - Implement and deliver
Ready to startoff.