Q: Is there anything else I should know?
A: It is a good idea to clear your computer's cache before you sign up to a site and/or complete an offer. This does not harm the computer at all. There are some files in a computer's cache that can interfere with the sites when you sign up so it is best to remove them. This can be done by opening up Internet Explorer and clicking "Tools", then "Internet Options", then clicking "Delet Cookies" and "Delete Files".
Also note that the sites only allow one account per person, per address so to make sure you get your gift do not sign up if someone in your house has already signed up. To be safe it is best to avoid using the same computer as someone else for the offers as the sites can track IP address if they supsect there has been infringement of this rule.