Place a 2 high ring of bookshelves around the enchanting table with one gap so you can walk through. PS you can place torches between bookshelves and enchanting tables to take away the effect of the bookshelves (if you need lower level enchantments)
That's because you only need 15 bookshelves, as others have already said.
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I must not fear. Fear is the mind-killer. I will face my fear. I will let it pass over me and through me, and when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.