What's missing in the crafting / blacksmithing system is the visual recipes.
I'd appreciate if in the books you'll have pictures of the ingredients which are required. Additionally to that, every time you are able to guess something, a page with recipes is updated.
[Also, if you are able to guess a recipe, it's nice to get some XP for it. Of course, people will exploit to get XP as they're read the recipes from the internet, but for the ones that won't do it... It's a nice encouragement to keep on experimenting]