I've only once seen someone straight up pull out the core with no prep, and just hit it.
It was on a ship on the planet Altorin, during the Dawn War. A group of mercenaries had just captured a prisoner. At the launch bay, an Altari general demanded the mercenaries turn over said prisoner. To this, the captain said, "Ever person who has ever gotten in my way has in some way or another wound up mangled or dead," which was mostly true, at the time, and which scared the general off, but not his troops. So there was a fire fight to get in the ship, during which, Allen, the ship's engineer took to prepping the engines. Instead of the normal 8 hours it takes, he decided he would try to prep the engines in 1 minute.
Go ahead, re-read that sentence. It is not a typo.
The first step is a manual release of the core containment. To do this you need tremendous control of the muscles in your arm, and the ability to calculate the exact pressure the core needs to stability at every millisecond of its ejection from the stasis field. Allen had muscle control do to the cybernetics, and he could do the math, which was good because had he been a hair slower, a hair faster, or a nanometer off in his calculations, he would have detonated the ship, and quite possibly the continent.
Once this part was over, he aligned the crystals manually, which was less impressive, but also very difficult and exceedingly unsafe.
Then, the ship took off and the crew proceeded to dodge fire from the Altari and the Kitorin for half an hour before commencing a blind jump into a planets atmosphere. They crash landed, and survived, which was indeed surprising for all aboard.
Except the fish. The fish died in the landing.