be in (one's) element

To be doing something that one is very comfortable with or proficient in. My mother is in her element in the kitchen and can make just about any dish.

Common Names:

Name	Pronounced	Usage
Hildegard	HIL-de-gahrt (German)	German, Swedish, Norwegian, Danish, Ancient Germanic
Gisela	-	German, Dutch, Spanish, Portuguese
Thomas	['tɔməs]
Pene	-	English (Rare)
Lorenza	-	Italian, Spanish
Andras	-	Welsh