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The Workshop Manual description suggests it's straightforward:
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Treat every nut, bolt and in this case screw on this car like it's a one time shot at getting it off. use the right size screw driver and be on it square BEFORE trying to loosen it.