He is always picking holes in every project.

To break the ice

A black sheep

I am ambitious and never want to <u><em>rest on my laurels</em></u>.

Manoj always <u><em>keeps himself to himself</em></u>.

To turn amuck

The authorities <u><em>took him to task</em></u> for his negligence.

Since he knew what would happen, he should be left to <u><em>stew in his own juice</em></u>.

Sachin <u><em>has bitten of more than</em></u> he can chew.