your ISP (comcast) should have the addys on their web site, if you want to change back. With Time Warner, they did, I have been using OpenDNS since ours was switched to comcast (ugh, I really hate them, they are crooks) But thats another story.
Anyway switching is painless, and you can always switch them back if you are not pleased. Its not permanent its only redirecting your dns.
Like said, it all boils down to a matter of personal preference, I have not ever had much trouble with phishing, but the vast majority of sites I visit, I know and trust.
A rubber band pistol was confiscated from algebra class because it was a weapon of math disruption.