Just set aside time. I got about a dozen listings claimed and/or taken down in an afternoon and did a couple more followup rounds. I wrote a couple of DMCA takedown requests, which took a bit of time to be sure I was communicating effectively. LinkedIn took awhile as I had an interest in maintaining my profile with the right level of privacy, requiring some writing work. After search results update, you’ll probably find new listings to investigate that weren’t ranking highly before. Like wittyusername said, it takes multiple passes. Also, don’t forget to check Internet Archive results. And don’t be afraid to use the phone; a couple of sites were more reachable that way.