Nail Wraps

I'm really wanting to try nail wraps at home but the last time I got them I made a complete mess of them. Has anybody got any tips for using them? 

Thought I'd share some designs that I really want to purchase, definitely going to order at least one set once I think I'd be able to get the hang of using them.

As you can see I'm not really fussy with which I buy - these are all available from ASOS for  £6.70. Or if you're lucky and get student discount and get 10% off!