set about sth

to start to do or deal with something, especially in a determined or enthusiastic way

开始做某事，尤指以坚定或热情的方式

I have no idea how to set about changing a tyre on a car.

我不知道如何更换汽车轮胎。

I tried to apologize, but I think I set about it the wrong way.

我想道歉，但我觉得我一张嘴道歉就说错话了。