Parchment-making is not quite so common a skill, but Brother Uhtred has some experience with it and will be bringing his supplies – a drying-frame and lunellum; I am sure he will be eager to teach the process to anyone willing to learn. From observing him I have seen that the hides are first soaked in water with lime, to remove the hair; then rinsed, and soaked again, and so on until they are quite clean; then he stretches them upon the drying-frame and tightens each peg as the skin dries, so that it will be flat and of a good thickness. He scrapes the skin with the lunellum until it is fine and smooth, and rubs it with pumice powder so that it is better able to take the ink, and then when it is dry the skin can be cut to the proper size (Theophilus, 12th c). If you are fortunate there may be a parchment-maker in a nearby village; if this is the case you can of course trade to obtain a ready supply.
You will also need tanned or tawed leather for covering the bindings of books, and alum-tawed thongs for sewing together the quires; a village of any size should have a tanner who can provide these things. The wooden boards for the binding can be cut to fit the manuscript; the best wood is oak (De Hamel, 1994).
