Stepping into the Limelight is stepping into the bright lights that hit the stage.
It's sisters stepping up. Only if the sisters owned stepping up would it be possessive.
No. And if stepping is used with a noun, it is not actually an adjective either, but a noun adjunct (e.g. stepping stone).
form_title­= Stepping Stones form_header= Liven up your yard with stepping stones. Where can I find details about these stepping stones?*= _  Is there a way to improve these stepping stones?*= _  How much do these stepping stones cost?*= _ 
Stepping into Tomorrow was created in 1974.
Stepping Toes was created in 1938.
Stepping Selection happened in 2000.
Stepping Selection was created in 2000.
I'm Stepping Out was created in 1980.
The duration of The Stepping Stone is 3000.0 seconds.
Stepping Stones - home - was created in 1920.
Stepping Stones - album - was created in 1999.