As a Bocchi the Rock and anime fan, I like to follow this sort of thing and came across this series of videos where the voice actor of Bocchi (the main character) goes through the journey of learning how to play the lead guitar for one of the songs.
Quite inspiring to see someone that never picked a guitar getting through the stages needed to eventually be able to play the song in just a few months and being pretty decent.
I found the tabs online and it seems like a complex song to be learning as a first timer, plus it’s played at 190bpm - I can barely play at 100bpm sometimes 
Some episodes are just fillers, so you might want o skip that.