Overestimating

I think overestimating the people masterminding that conspiracy is exactly what they want.

You are overestimating my English level!

I want to make sure I'm not overestimating my abilities.

Overestimating your strength can cost a lot.

Don't you think that you're deluding yourself and don't you think that you're overestimating your own strengh thinking that you can carry such a heavy box all the way to the living room and that includes climbing one step after another without getting yourself hurt in the process?

That's what you call overestimating your own abilities.