Gather 4 Obsidian blocks
Gather 2 Diamonds
Gather 1 Book
Place 1 Obsidian block in each of the four corners of the crafting area
Place 2 Diamonds on the left and right middle slots
Place the Book in the center slot
Craft the Enchantment Table
(Optional) Place the Enchantment Table in the world
(Optional) Build an Enchanting setup by placing Bookshelves around it to increase enchantment options