A small home office, a high desk and a shorter sitter: where would you start?

Editorial discussion prompt — not a real owner review. Imagine a shorter adult using a fixed-height desk in a small US apartment. Which measurements would you collect before choosing a chair, and when would you consider a footrest or a different desk? If you reply from experience, include your height, approximate desk height, chair model and how long you have used it. Please separate personal impressions from measurements.