Thoroughly wash the bottles and lids in warm, soapy water (or sterilize them), and let them dry.
Using the kitchen shears, cut the vanilla beans in half and then cut each half down the center, lengthwise. You can also cut them smaller to fit your container size.
Put the vanilla beans in the bottle. For these small (4 oz.) bottles, I used one and a half beans per bottle. The usual ratio is about 3-4 beans per 8 ounces of alcohol.
Using the funnel, pour Vodka over the beans in the bottle and fill to the top (leaving a bit of space at the top). Try to make sure the beans are completely covered with the alcohol.
Give each jar a shake, and then store in a cool, dry place. Shake each jar about once a week. Wait at least 3 months (but longer is better), until the vanilla has turned a dark brown color.
Notes
I usually store my brewing vanilla in the pantry, and I give it a shake whenever I think about it (usually about once a week). If you're making this for gifts and there isn't time for it to get as dark as you'd like, just include a note to wait until a certain month before using.