It is a fairly straightforward task.
The objective end of the scope is threaded inside. There is a lock ring with 2 notches that are 180 degrees apart. Make a tool to remove the lock ring.
Once the lock ring is removed then you will be able to adjust the objective lense.
I have adjusted several scopes that I use for shooting at 10m airgun match targets. You can't hit a bullseye the size of the period at the end of this sentence unless the parallax is adjusted perfectly. And even if the scope came with AO from the factory it is always a bit off or won't adjust low enough.
On higher end scopes I would probably follow Dean's advise. If they found out you fiddled with it yourself you probably wouldn't have a warranty.
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