WOOT!
I finally managed to 5 star those songs.... I was up late playing them over and over again, carry me home was just murdering my fret hand and Institutionalized was murdering my strum hand.
I got up early the next next day to see if I played any better fresh in the morning and I nailed both of them in under 2 tries each.
I really didn't play them any better then I had in the past but the I managed to play through the non-difficult sections perfectly and used the star power at the best possible spots.
Also turning down the band and croud helped me learn the songs and once I knew them well I did better with the band back in place (listening to the drummer helps me keep tempo, particularly on Institutionalized)
After that I went on to get the 300K achievement (Free Bird on Medium) and the 500 Note streak (Less talk more rokk).
I wish less talk more rokk was longer, I Full Comboed the thing for about an 850 streak... I could have kept going right to 1000 if it was long enough
after that I went though and played enough on Hard to buy the rest of the guitar finishes and complete the shop.
I think I'm done with the game for now until I find someone to help me with the co-op achievements...
If I put my mind to it I could probably 400K/1000 streak Freebird on Medium and maybe complete Hard (I was able to 5 star most of the first two sections). But I don't like Free Bird enough to spend that much time with it and I have lots of other games to play
Thanks for your help guys.