Welcome To Guitar Tricks.i Was The Same Way Jump From Here To There And So On,not A Good Idea I Soon Realized.its Not How Long You Practice,but How You Practice Is The Key To Improvment.i Would Pick A Song I Want To Learn,learn Some Of It Then Go To Another Song Ect.so Now What Ever It Is I Finish It Untill I Can Master It.theres Nothin Wrong With Thumb Nailing Gt,but Stick With What U Had Started.goodluck.