You can use the above posts for excellent results.

Another method is to simply play what you can, and get comfotable with the more difficult parts by starting with the parts you understand, and taking on the tough stuff step by step, never going past your own abilities... Like,... cords and a few notes, a few more notes, a position change, a different chord that fits better, and then the final notes you couldn't get...
the key this technique is to catch what you can, and work the rest in when it comes, and knowing that it will come! Layers of complexity that we peel back... Also, if you improve your technique in the LISTENING, your playing will respond dramatically, assuming of course, that you let yourself be as good as you are!!! ttr