VAT is always included in the price, it is a consumption tax that is added at different stages of production. It is called value added tax because at each stage there is tax associated with the value added to the item, that is why it differs from sales tax and it is not added at the end. EU countries have varying VAT rates of up to I believe 25% and most have reduced rates that apply to certain goods and services. It is not like US sales tax.
LV will provide the necessary instructions and paperwork as all luxury shops do this every day.
Anyway, here is a link to calculate how much you will get refunded. You just choose the country you are buying from, and the purchase price and it will calculate for you. HTH.
http://www.globalblue.com/customer-services/tax-free-shopping/refund-calculator/