It's not hard but it takes some patience and craftsmanship to build a good one. There is a BCY video/DVD that you can get from Lancaster Archery: http://www.lancasterarchery.com/shop...=3a&page=1 It gives you the basics to get you started.
www.mac.asn.au/string_making[ basic but well explained]www.lawleroutdooors.com[more advanced very good helped me make modern hightech strings i learned alot try these the first on is very easy to understand very clear