The phrase "ability to step into" is correct and usable in written English.
It can be used when discussing someone's capacity to take on a role, responsibility, or situation.
Example: "Her ability to step into leadership roles has been invaluable to the team during challenging times."
Alternatives: "capacity to assume" or "skill to take on".
Or, in this case, our ability to step into our partner's shoes?
"She's extremely confident of her ability to step into any situation and command it".
He also continued to raise questions indirectly about Mr. Bush's ability to step into the role of commander in chief.
A clue to Wenger's thinking came when he discussed Nasri's ability to step into the shoes of Fabregas as the heartbeat of the team.
Although Gore advisers saw immediate weaknesses in Mr. Cheney's voting record, they also saw that Mr. Bush had picked someone whose ability to step into the Oval Office would not be questioned.
And psychologists have demonstrated that the empathic ability to step into another's shoes and appreciate that their viewpoint may differ from our own develops in most children by the age of about two.
I have the ability to step in but it is one that should be exercised sparingly.
… Matt Yates has the ability to step in.
Rob Wilkins, Pratchett's long-time assistant, friend and business manager, has called Kidby the author's "artist of choice", adding that "Terry often commented that Paul must have the ability to step right into Discworld, because the accuracy with which he depicts his creations often surpassed his own imagination".
Courage is not the absence of fear, but rather the ability to step right into it.
Much as Google was able to win the search wars against Yahoo and Microsoft, and much like YouTube was able to win the social video wars against Google, Apple is in the precarious unassailable leadership position facing unknown competitors with the uncanny ability to step up college campuses and into the limelight.
