it's a cinch

a cinch (something that is very very easy to do) — раз плюнуть, плевое дело; легче легкого, ерунда;

Example 1: From the cranberry stuffing down to the pumpkin pie, the recipes are a cinch to prepare and so scrumptiously low in fat that you can celebrate the indulgence.

Example 2: It’s a cinch to play this game.

Obviously, something that is not a cinch is very difficult.
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cinch — certainty
1) cinch to + inf. (he's a cinch to be elected)
2) cinch that + clause (it's a cinch that he'll win)

see also

[as easy as pie]
[piece of cake]
[раз плюнуть]
[walk in the park]
проще пареной репы
kids' stuff