Got reminded that I played this by a recent post by @Linked713 :P I loaded up my guitarist and hopped into where I left off in hard mode.. at Enter Sandman.
So I tried it and failed in a most terrible way XD So.. off to practice! I was doing ok-ish at 70% speed but still missing a decent number of hammer-ons in the solo section in particular. So I focused on that at 50, 60, and then 70 speed.. I was still missing them pretty frequently but at this point my arms were getting stiff.. I had been practicing this one song for over an hour! .. Of course it probably didn't help that my trainer really put the strain on them at the gym that morning ;D I decided to give it another go at full speed to see if I could at least finish the song.. nope! I didn't even last until the solo! So I'll be doing it again another time :D