For one its pretty hard to accuratley valve shocks without the use of a dyno....even though I admit I do at times throw shot in the dark stacks together I would not reccomend some one just learning do it. It's like setting tire pressure with your thumb.
If you just want to have the valving changed I would reccomend you have them serviced by a competent shock specialist.
If you want to learn about how to do it yourself....I would start by downloading a few manuals from Penske's site and attend one of the shock courses offered by either Penske or ohlins.
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