second gear

all the gear and no idea

Having high-quality, expensive equipment for a risky or difficult activity, without any of the requisite knowledge.

click into gear

To start to perform effectively or to progress

find another gear

To suddenly achieve an extra burst of athletic performance, especially after a sustained period of competitive exertion.

fourth gear

A maximal level of effort.

gear up

To prepare for an activity.

get one's ass in gear

To exert effective effort; to get going; to get moving; to start producing.

have second thoughts

To change one's opinion, or be uneasy about a previous decision.

just a second

A short period of time, typically anywhere from a few seconds to several minutes or more.