Alright, well I do not personally own that book, but you can find some reviews by experienced and novice slingers alike for it here: http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=114999035 As for the difficulty level: the sling has a notoriously steep learning curve (as is mentioned in the above link). However, please don't let that discourage you, the ability to send rocks sailing hundreds of yards out onto a lake dosn't take much time at all and is a lot more fun than it sounds . The accuracy of the ancients (as well as some modern shephards) is truly incredible. One example is mentioned here: http://www.slinging.org/22.html. With longer slings though, romans could hit small bundles of reeds with lethal force a couple hundred yards away; in fact they were used in many cases like modern snipers. So, while there is no doubt of it's potential, it will take a lot of practice to get you there. It's much like learning a musical instrument, difficult at times yet very rewarding along the way. One key distinction is however, that when practicing, don't get frustrated, focus, yet let your mind blank, I've written a bunch on a 'zen' approach to slinging, so won't elaborate here. If you'd like to give it a try, but don't want to purchase anything, just visit us over on the forums, we'll be glad to help. Also, if you become a slinger, you'll find yourself there anyway . To give y'all an idea of the variety of slings, check out this gallery: http://www.slinging.org/membergallery.html Scroll half-way down the page to see a true piece of art by Benjamin Scott. Update on my keychain project: I just finished braiding a split pouch sling (that is, no fabric for the pouch, ammo is held by two cords). I constructed it out of normal mason's line, and is round-braided 6-ply, three strand braid, two strands per strand. It splits to a three strand flat-braid for a 5 in split pouch. It is 63" unfolded. Now what will make this special is that, where the strands double over to form a naturual loop on the retention cord, I'll be inserting a typical key-ring, which will serve as the finger loop. On this key ring will also be a 'quick detatch' clip (not sure which style yet), and the other half of which will be tied into the release cord, and serve as a toggle. The whole sling will be folded over in half and then tied up with the "Monkey Chain Knot" (which I demonstrated here: http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=1141448591;start=0 ; don't worry, this one looks INFINITELY better). To seal off, the quick clip thing will be clipped into place, and will form a keychain/zipperpull between 3 and 6 in. long. The beauty of this design, is that after detatching the clip, one quick jerk will unfold the entire sling. I'm sorry about the lack of photos... my camera is currently decommissioned, they may have to wait a few days.