Growing Vanilla At Home...or Maybe Not :)-

Is it possible? Yes it is.
Are you likely to succeed in such an endeavor? Probably not.

A member of the orchid society to which I belong has one in his greenhouse and it has grown everywhere, at least twenty feet from its pot in several directions and up into the roof structure of the greenhouse another twenty feet.

If you've managed to get to this point you'll run into another problem, pollination. The insect which would normally take care of this doesn't live in your climate so you would have to hand pollinate the flowers. <snip> given the size and growth habit of the plant it still won't be easy and is farther complicated by the fact that the sap of the plant can cause dermatitis if it comes in contact with your skin.

A couple months later if you've done everything right, and once you've recovered from falling off the ladder and that irritating rash on your hands and arms has finally gone, you'll have some vanilla beans. Once they get about eight inches long and turn dark brown they are mature and can be harvested. There's that irritating rash again. Having fun yet?

By now you've spent enough money on greenhouses, climate control, fertilizers, pesticides and medical bills to buy several hundred pounds of the beans so save yourself the effort and head to the market to buy them instead of going through all that.