Do you want to run multiple accounts? Then yeah... you'd need some good private proxies. There's a guide on here by @
(you need an account to see links), not sure if he recommends any good private ones though.
If you aren't, then just unplug your internet modem for a few minutes and then check if your IP changed (or call your ISP for them to do it). Make sure you clear your cookies and browser settings before registering/logging back in. A proxy does not do anything when running bots except hide your identity.