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The Wikipedia entry for Lidocaine offers basic information for those unfamiliar with this useful substance.
Amal Graafstra's Pain Management Kit includes 35mg water soluble Lidocaine HCl, saline solution, injection equipment, and a natural latex rubber tourniquet.
Augmentation Limitless, Cassox's blog, has a guide to performing a digital nerve block with Lidocaine prior to implanting a magnet in the fingertip. The blog in general is a hugely valuable resource for anyone performing their first DIY biohack.
Cassox's Video Demonstration of a digital nerve block.