Don't cut freshly baked scones, pull them apart with your fingers instead. Cutting ruins the texture and makes them clumpy. Scones stale quickly; eat them the same day you make them.
If you don't have sour cream, yogurt or buttermilk, add 1Tbs lemon juice or vinegar to 1 cup milk and let stand for 5 minutes. Use this instead of sour cream, yogurt or buttermilk.