This is going to be really easy once you get the hang of it.

This is going to be really easy once you get the hang of it.
一度こつを飲み込んだら、これは非常に簡単さ。

"I've read the manual twice but still it doesn't make much sense to me." 
"Just give it a go and you'll soon get the hang of it."
「マニュアルを2回も読んだけど、あまり理解できないんです」
「とにかくやってみなさい。すぐに慣れるから」

get out of the hang of
～のこつを忘れる

get one's coat off and hang it over the banister
コートを脱いでコート掛けにかける