I have the proper tool(s) as described above. I usually just use a quality 18" adjustable wrench with a long cheater pipe on on the end. Push in on the jaws of the wrench (towards the bottom bracket) to keep it from slipping off, two fingers on the cheater pipe with slight downward pressure running my hand away from the bike slowly... have yet to break a sweat or a part. I've never had to do this, but if I still had problems, I might consider some medium-hard taps on the face of the cup with a soft-face dead blow hammer while turning whatever wrench I chose to use --- much like an impact driver.