Translation of "practiced" into Japanese

There nothing so difficult but it becomes easy by practice.

どんな難しいことでも慣れれば容易になる。

It ́s all very well in theory, but will it work in practice?

理論は結果だが実際にうまくいくだろうか。

Can we be generous with our time after a meeting, aiding someone in need, such as by listening to a brother practice his talk?

集会後に時間を取り,割り当ての練習を聞いてあげたりして,仲間の助けになれますか。