2018 ec 300 power valve issue

[Sterlo300]

Hey guys,
Over the weekend I decide I wanted to see what setting my power valve was at so I found this video and followed its instructions

https://youtu.be/lu3T-ctnzKY

I did have one problem, after loosening the lock nut I found that the lock nut was seized to the alan key so I did something silly and removed the lock nut with the pin inside so I could free up the lock nut. Well after freeing up the locknut I re installed it back into the bike, i set the pin at 2 turns out then tightened the lock nut. When nipping up the locknut it started to turn something inside the motor so I stopped what I was doing and called my local gas gas dealer. They are saying I need to bring them the bike so they can reset the power valve, is this an easy job that I would be able to do myself?
I'm pretty annoyed at myself for stuffing this up so just wanted other people to know so they dont make the same mistake I did.