Many of these offers do not send confirmation e-mails (they want you to forget you ordered it)- so it is a good policy to read the Terms of Service (TOS) of EVERY paid offer, and write down the phone number that is listed for customer service or cancellation. Once you complete the offer, look for an account number or account name, and make sure you know what e-mail address you used to sign up for the offer. This way you can contact the company once the offer clears, and cancel your free trial to avoid further charges.
I use one e-mail address for all CC offers, and I usually only do one or two at a time so I don't forget about them and wind up paying extra money for something I'm not using.
***If you want to do a CC offer, but do not have a credit card, or don't feel comfortable using your credit card, you can always try purchasing a pre-paid credit card :) You can get them at your local mall or online- just google or blingo "Pre Paid Visa" and you'll have a ton of sites pop up- Simon cards are good ones.
