Theres really no need to worry about jumpstarting a car from another battery or another car. Just make sure the engine on the other car isn't running and that the ignition is of on the car with the flat battery.
Safest way to do it is;
1: Both cars have their ignition off
2: Connect the positive pole to the positive pole on the other car
3: Connect negative pole on good battery with chassis ground as far away from the battery as possible on the car with the drained battery.
4: Start donor car
5: Start the other car (or try to start it that is
Now; here comes the important part
6: Do not remove the jumpercables untill both cars have run for a minute or two.
This is because the drained battery will put a big strain on the alternator on both cars, and if one battery is all of a sudden removed, the voltage will suddenly rise and then there's a probability of a power spike that might destroy something most often on the donor car.
7: After a few minutes remove the negative jumper cable from the chassis ground, then remove it from the other cars negative pole.
8: Remove positive jumper cable.
I have used this method for jumpstarting cars at the different dealerships I used to work in more times than I care to rembember (in excess of 500 times), and I have never experienced any mishaps. If you just follow the guidelines above nothing will happen.