Don't pull the HT cable. find the solid cover over the plug.and pull that.
Your damage the conducive core in the cable
watch this guy,his got a bit of a clue
http://www.youtube.com/watch?v=ddz0iUMFMgc
http://www.youtube.com/watch?v=_IgctXkWE-w
Biggest mistakes are,don't over tighten things ,get a toque wrench.
Make sure the old oil filters rubber sealing ring is not stuck to the filters housing the engine.