Choose the dome size and center point
Mark the center on the ground
Build a circular base outline
Raise the walls evenly around the circle
Make each higher layer slightly smaller than the one below
Continue shrinking each layer toward the top
Keep the shape symmetrical from every side
Fill in gaps as you go
Cap the top with a single block or small flat top
Smooth the outside edges if needed
Remove temporary support blocks
Add windows, doors, or lighting if desired