Get ya some contact cement, a bow without a handle wrap and some newspaper for the kitchen table.
Do a couple dry runs. Spread contact cement on the bow handle where leather will be and on the back of the leather (a sizing coat and then a final). Start at the back at the top and wrap the handle, butting the edges up tight. Pull hard and it should form to the contours. Then take something with a sharp corner and work all the edges together so you get some texture to the wrap.
After all has set up for a while, rub it down hard and doublecheck for gaps, high spots, etc. Then rub all the extra cement off with your finger or a pencil eraser.