The only bad thing you could do (if you were really dopey) is unscrew the collimation screws a few turns so that the secondary mirror falls out of it's holder. Short of this, if you somehow got lost doing a collimation the people at Bintel would have it sorted out again within a few minutes - so there's nothing to be scared of.
After ordering bob's knobs, get used to what the mirror reflections look like from various distances in front of the ota (looking in through the corrector in daylight from 6 to 12 feet away). You could turn one screw 1/8 of a turn to see the change in the reflections, then turn it back. Instructions come with bobs knobs telling you how to re-center the various reflections to acheive rough collimation.
Then follow one of the guides for collimating on a star.
Or, if it already looks good on a defocused star at high magnification you could leave it be
