A: Oh, you are never going to pull this off.

B: Watch me. Tonight, I'll hook a guy. Tomorrow, pull the switch.

pull off :to succeed in doing sth difficult 做成,完成(困难的事情)
We pulled off the deal.
我们做成了这笔交易.
I never thought you'd pull it off.
我真没想到你把这事办成了.