Well with all the local bike shops and mobile bike guys backed up 2 1/2 weeks i too a crack at adjusting the rear Derailler myself after watching a YouTube video.Its 95% better than it was after adjusting the h and L screw on the Derailler Itself and some barrel adjustments.Watched a park tool video you had recommended.Im going to go ahead and make that appointment to have my bike gone through after 100 miles but am glad I was able to tackle the job myself.Just has a very minor hiccup when shifting from 6th- 7 th gear. Everything else is spot on well as good as it could be with these lower to mid end Derailler a they put in these.