You don't. You get your mechanic to do it. That way you can be sure that you don't do something wrong.
under the handbrake
The clutch is hydraulic, and as such self adjusting. There is no way to manually adjust it.
To replace the handbrake cable on a 1998 Vauxhall Vectra 1.8, start by safely lifting the car and removing the rear wheels for access. Disconnect the old cable from the handbrake lever inside the car and under the vehicle at the calipers. Install the new cable by routing it through the same path, attaching it at both ends, and then reconnecting it to the handbrake lever. Finally, adjust the tension as needed to ensure the handbrake functions properly.
To adjust the handbrake on a Vauxhall Vectra 1.9 CDTi, start by ensuring that the vehicle is on a level surface and the wheels are chocked. Locate the adjustment nut under the center console or near the handbrake lever; loosen the locking nut and turn the adjustment screw to increase or decrease the handbrake tension as needed. After making adjustments, tighten the locking nut and test the handbrake to ensure it holds the vehicle securely. If necessary, check the rear brake shoes or pads for wear, as this may affect handbrake performance.
It is very easy to adjust the handbrake on a Vectra C. All you need to do is remove the rear console and release the handbrake. Under the handbrake is a cable with a white end fitting, push down the end fitting onto the plastic locking device. Then pull the lever and it will be adjusted.
If it has rear drum brakes, it's under the car, where the handbrake cable emerges from inside the car. If it has rear disk brakes, there is addition adjustment inside the rear disks on the handbrake shoe mechanism. This adjustment should be carried out before attempting to adjust the cable.
16 pinconnection can be found under plastic cover directly under handbrake
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The tickover is not adjustable. It's electronically controlled, and factory set.
no as it is hydrolic and these sort of clutches are non adjustable were as cable clutches you could adjust them.
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Vauxhall Vectra wiring diagrams: http://www.pdfoo.com/resultpage6~vauxhall-vectra-wiring-diagrams.html