Gather 4 obsidian
Gather 2 diamonds
Gather 1 book
Open the crafting table
Place 1 book in the top-middle slot
Place 1 diamond in the middle-left slot
Place 1 diamond in the middle-center slot
Place 3 obsidian in the entire bottom row
Place 1 obsidian in the center slot
Take the enchanting table from the result slot