Hi there:
It depends on what condition you'd like to get rid of

If you're having general bad luck, you may be what is called in Hoodoo under a "crossed" condition. The Uncrossing Kit would be a great all-in-one item you could purchase; I've used it myself with lovely results:
http://www.luckymojo.com/spell-uncrossing.htmlAnd you can absolutely call the store to ask brief questions; the people there are helping customers and don't have a ton of time to talk or give advice over the phone, but they can point you in a general right direction. Or use this forum! It's here to help with the use of Lucky Mojo products

Good luck,
waterborn