You have to register if your sales are over £82,000 for the last 12 months. So, not many Stylists need be concerned with VAT from the start.
Below this level of sales, registration is voluntary. The benefit of being VAT registered is that you get to deduct the VAT on all the products and marketing material you buy from MyShowcase to promote your business - and potential on more expenses such as computers and mobile phone bills.
The downside is that you need to become a more careful record keeper and may even need to pay an accountant to take care of the filings. You should take advice from an accountant before registering for VAT.