go too far, jump the gun, press your luck

先走り(さきばしり)	To jump the gun – to move too fast. To do something prematurely.

席越す(どうをこす)	Same as 調子に乗る

調子乗る(ちょうしにのる)	To press your luck, to carry something too far.

あんまり	Used about a thing/situation/extent. Too hot, too far, he studied too much and now he had a breakdown.