You use the expression child’s play when you mean that something is very easy to do.
Examples:
I finished the test very quickly. It was child’s play!
Stop trying to fix the car and call a professional mechanic to do the job. This is not child’s play.
If you get a handle on something, you begin to understand it.
Examples:
I used to be terrible at maths but after lots of hard work, I think I’ve got a handle on it now.
If I could just get a handle on this new project at work, I’m sure the boss would give me a pay rise.
If something or someone is too hot to handle, it is too dangerous or difficult to deal with.
To get your ducks in a row means to organise your things well. It’s American English.
Examples:
With the recession looming, the government has to get its ducks in a row and invest in job creation.
The company’s owner has given his managers a few days to get their ducks in a row. If they don’t improve their performance he’ll fire them.
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