It's not possible to exclude specific IPs from being picked up, but there are some good ways to test it out in any case.
A couple of suggestions:
1) Use a VPN such as Astrill, details are here: https://shopifyninjas.zendesk.com/entries/98186047-How-can-I-test-that-the-IP-Redirect-Plugin-is-working-
2) Or, the easy way is, if you go into your store inside Theme Settings, you won't get redirected, regardless of your IP. So for example, if you were setting up a site for Australia but you are in the US -- if you visit the AU site from a US IP on the front-end, you might get redirected if you enter that way. So what you can do instead is, go into your Australian store from the Admin > Themes > Customise Theme. That way you can see & test as needed, without being redirected.