Unless you enjoy warm, flat Champagne, your bottle should always be chilled before serving. The optimal temperature for any sparkling wine is 47 to 50 degrees Fahrenheit. At this temperature the wine is likely to have crisper, tighter bubbles, and the best aroma and taste.
Sit the champagne or sparkling wine on a flat surface and keep your one hand on the cork. Then twist the bottom of the bottle. Never twist the cork to open champagne or sparkling wine. You should feel the cork loosen as you go.