***Think on your feet -***

Meaning - Adjusting quickly to changes and making fast decisions.

Example - A good sales man must be able to think on his feet to close the deal.

***Sail through something -***

Meaning - Being successful in doing something without difficulty.

Example - The presentation at the national conference was extremely important for the company. We sailed through it.

***Tricks of the trade :***

Meaning - Clever or expert way of doing something.

Example - Being into the construction business for last 10 years, I know all tricks of the trade.