I sometimes get worried in this job. Having said that, I enjoy doing it, it's a challenge.

我有时会为这份工作而感到忧虑。话虽如此，我还是蛮喜欢干的，因为这是一个挑战。

《牛津词典》

I enjoy a mental challenge.

我喜欢精神上的挑战。

youdao

I enjoy the challenge of extending my faith and allowing the creativity of the universe to reveal what lies ahead.

我享受这种延伸我的信仰的挑战以及承认宇宙的创造性是为了去发现前方有什么。

youdao

And it was a challenge for a while, but I enjoy learning different languages.

当时那还真是个挑战，但我喜欢学习不同的语言。

第二外语，英语 - SpeakingMax英语口语达人

Unfortunately, while I do enjoy the challenge of PvP more than the PvE campaign, I still find the combat flat and lackluster.

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I'm looking forward to the challenge and I'm sure I'll enjoy it.

BBC: Yorkshire sign New Zealand paceman Daryl Tuffey

"It will be a big challenge but it's one I'm going to enjoy, " said Harris.

BBC: Iestyn Harris replaces Brian Noble as Crusaders coach