I have serious reservations about his ability to do the job.

我非常怀疑他有没有能力胜任这项工作。

The ability to do almost anything you like is powerful, but it can also lead to uncertainty about how to establish a standard approach to development.

可以做几乎任何您喜欢的事情的能力是强大的，但是它也会导致您不确定如何建立标准的开发方法。

Or losing the ability to do something.

或失去做一些事情的能力。

KNOW that you have the mental ability to do well.

你要明白你有能力去做好。

Like other candidates, I have the ability to do this job.

和其他人一样，我有能力完成这份工作。