stuck on crafting enchanting table

for when it's down: you need 15 bookshelves to get level 30 enchants, set around it with exactly one block of air between the table and the shelves. a torch or carpet in that gap blocks the shelf behind it, which is why some people's tables cap out lower than they should. and bring lapis, it won't enchant without it.

if it's the recipe, four obsidian, two diamonds and a book. if it's the obsidian, that's usually the real problem - pour water over a lava pool and then mine it with a diamond pickaxe, because anything less and it breaks and you get nothing for the four minutes you spent. bookshelves come after and they go one block away from the table, not touching it.