I do small-scale alterations for a shop. (I am not subject to VAT.) I am still struggling to estimate how to determine the amount of inventory. Should I include all the machine needles I have purchased for my sewing machine, thread and fasteners in the inventory? These are things I need to be able to do the alterations. Because this grew out of a hobby, I already had a small inventory to make things for myself. How can I best determine the value of this and keep track of it/list it so that it is clear and accurate?