Prepare your vanilla beans (for every 8 ounces of vanilla you want to make, you will need 5-6 vanilla beans).
Slice one side of each bean open to expose the inside.
Submerge beans in alcohol.
Now, fill your jars with alcohol. My booze of choice was a cheap, unflavored vodka. You don't need expensive vodka to make this work.
Wait. Every week or so, give the jars a good shake. Some say wait about 6 weeks. Some say 6 months. The longer the vanilla sits, the more complex the flavor will be so I gave mine a good 5-6 months.