Map out your itinerary
For visits to several Schengen countries, the European Commission’s general guidance directs you to the country where you will spend the longest time. For equal stays, it points to the first country you will visit. Confirm your specific case with the responsible consulate.
Keep residence in the picture
Applications generally go to a consulate with responsibility for where you legally live. Being resident somewhere and holding that country’s passport are different things.
Leave room to prepare
Look into appointment arrangements and document instructions before committing to a tight itinerary. Keep plans consistent, and use the official country portal for local details. A preparation checklist does not establish visa eligibility.
This guide is a starting point. Follow the instructions for your own application.