Few questions before swapping engines!?

Few questions before swapping engines!?
Hey everyone... I havent really swapped any engines before. But i was wondering what i should do before taking out the old engine. What should i unconnect before pulling it out. Any suggestions or any easy tricks to doin so? thanx alot guys

What kind of Engine. My best suggestion would be to Lable each connector with a piece of tape and write what it goes to on it. any nuts and bolts, put them in a zip lock baggie and lable that. This will help ALOT

I would invest in a haynes manual as well to help you out.