You need a 3 jaw puller to remove the stock pulley....you can pick them up at the local parts store pretty cheap....I use a 7/16 bolt and heavy washer that I slide into the crank snout to push against.....as far as install , without the tool the method I pm'd you works incredibly well.
It was a PIA to ensure all three jaws gripped the inner part of the dampner evenly as they kept slipping off due to uneven pressure. But once I was able to get things lined up, it came right off.
For the install, I put silicone (Permatex) in the ATI dampner keyway so oil wouldn't seep through the keyway once installed. Not sure if this was needed or not, but better to be safe than sorry. I also used a little anti-seize around the outside of the hub to ensure smooth passage as it slips pass the front oil seal.
Finally, don't re-use the crank dampner bolt, get a new one.