It's a cinch

It's a (dead) cinch.

Fig. It's a very easy task. (Dead means absolutely.) Tom: Did you figure out how to change the tire? Jane: Yep! It was a cinch. Altering clothes patterns is difficult for me, but for Mary, it's a dead cinch.
See also: cinch
References in classic literature ?
It's a cinch. If one and two is right, then flour just has to go sky-high.
It's a cinch to make with leftover rice and lentils.
From there, it's a cinch for the employees to continue the working relationship in cyberspace.
I can't say I understand how the sharpening is done, but I don't really care because I like the result, it's a cinch to implement and understanding the technology won't improve the outcome.
As you know, it's a cinch to simply copy a chart created in Excel and paste it into another application.