folks, i want to change my current plugs from bosch super (2 electrodes) to bosch super 4 (4 electrodes).

i plan to do it when the engine is cold early in the morning.

i have done some reading up and see frightful stories like high voltage, "fragile" direct ignition coils etc.

some questions i have:
1. how do i open up the (BMW logoed) engine cover? how many screws and where?

2. do i need to disconnect the battery?

3. what are the correct steps to separate the ignition coil modules from the spark plug? - can this be done one plug at a time?

4. when tightening the plug, after tightening by hand, how much turns should i add using the wrench (i don't have a torque wrench).

5. any pictorials guide anywhere?

6. any other gotchas i should be aware of?

7. how long should this take for all 6 plugs?