Try again and don't screw it up this time.

再试一次，这次别搞砸了。

youdao

I've carefully mapped this out, so don't screw it up.

我已经仔细计划好了，千万别弄砸了。

youdao

Listen, I really want this thing to work so don't screw it up.

听着，我真的希望这个事情能成功，千万不要搞砸了。

youdao

If you screw it up we don't count it as much as if you do well.

你要是期中考砸了就给你在总评里降低期中比例

耶鲁公开课 - 1871年后的法国课程节选

And don't let us screw it up.

FORBES: Magazine Article

When you do something like this there is a chance, albeit a small one that you can screw up your device- if you're worried about this, don't do it.

ENGADGET: pt's "how to Tuesday" Overclocking your Pocket PC