This final piece is a real challenge. It contains time signature changes almost every bar and is difficult to play, but well worth the results if you persevere with it. Practice it every day for a few weeks and then leave it for two weeks, then come back to it and repeat the process. Each time you return to it, you will find it a bit easier to play. It may take several months before you can play it up to tempo, but this is the case with many advanced pieces in all styles of music. All really good players have got through the barrier of this type of disciplined learning and come out the other side at a true professional standard. Keep practicing, keep playing and good luck.
For more books and recordings by Peter Gelling, visit: www.petergelling.com