I'm not sure what stage your at but if your a beginner, like me. I would recommend spending a bunch of time on the arcade game string skipping saloon. I spent 20 hours doing almost solely this, id listen to a podcast (Joe Rogan) turn the game sounds low and just play over and over. I sucked at first but couple of weeks later i scored in the top 1% of players and i saw massive improvements in playing riffs which change strings frequently. I would then recommend joining the Rocksmith Championship on here, they put up new songs each week for lead beginner, int, advanced and master. Compete and work on that song throughout the week, you should be able to do alright with repeated practise and riff repeating the parts that are tougher for you. I've actually now progressed to lead Int :) . Then Generally just keep practising, i'm far from good, but i do feel like i'm making progress. I've only been taking learning seriously for a couple of months tops.