Found some pictures which might be of some help.
This is basically the screw but you'll find the hole on the top side. You can have an estimate by putting a long screwdriver I think "+" one, in that hole and the screwdriver should fit on the screw.
This is basically the architecture of the adjustment screw.
This picture belongs to the manual of 1998 Civic. Normally, the logic remains the same but the location of the hole may vary.
As far as the precautions are concerned, this is what the current manual has to say.