This was the first book that I had ever seen that seemed to offer full plans(well, yes, you need a photocopier with "zoom" features, but it still qualifies) and instructions for a nice-sized Celtic-style harp. I purchased the first edition of this book, and began to make the instrument. I found, however, that some parts of his harp instructions suffer from poor editing or printing errors. One paragraph mentions an appendix section that does not exist in the book. Others promised more coverage of finishing or building details that were never included, i.e. the rest he mentions for supporting the harp to make it easier to play is never detailed, though he did infer that there were plans/instructions later in the book. It is likely a very simple piece to make, but I think that his instructions should have been more complete. While his instructions are still useful for the beginning luthier, and you might still find it possible to complete the harp project, I would still be very cautious about using this book as your sole source for the more complex instruments. When the second edition became available, I had hoped that these errors would have been corrected, or at least removed. Unfortunately, that wasn't the case. No editing seems to have been performed, at least not in the harp section. I cannot speak for the other instrument sections, as I haven't built them, though their instructions aren't as involved as the harp instructions. Any budding harp-builders out there might want to first go and purchase from a company that sells harp kits, just to get an idea of the materials/effort needed. Hopefully this will give you the confidence needed to build one from scratch later, using Waring's book as part of your reference materials. ... The main thing is to enjoy what you create. Even with mistakes, viewing and playing your hand-crafted instrument can still provide you with a sense of pride and accomplishment, because you went though the effort. Good luck to those who take on this challenge.