To adjust the lever reach on new Shimano 11 speed shifters all you need is a white board marker and a flat head screwdriver. Start by making a mark across each lever with the marker. Then, peel back the hood and you will see a small slotted screw. On dura-ace and ultegra it is a slotted screw, on 105 it is a 2mm allen key.
Put the screwdriver in and start tightening it to move the lever back towards you. The marks will tell you how much you've moved and make it easier to match the to brakes levers.