be (as) easy as falling off (of) a log
be (as) easy as falling off (of) a log
To be extremely easy, simple, or intuitive; to require very little skill or effort. After so many years as an accountant, doing taxes is as easy falling off a log for me. Boy, that test was easy as falling off of a log!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.