Kids are all different. They react to changes differently than even their siblings. My first daughter transitioned to her crib with absolutely no problem. My second was a nightmare. Even with the crib right next to my bed. I had to throw out my "old" way of thinking and embrace something new. The fact is that some babies just don't sleep through the night at 7 months old. They still need to be fed on demand, even if that means it's in the middle of the night.
If Ferber suggests waiting until the hour long "party" is over, then that's what I would do.
I would start with putting the crib in your room, not in a separate room. Start him in his own bed at the start of the night. If he wakes and seems hungry, feed him, then put him back in his bed. You can gently pat his back until he falls asleep. If he wants comfort, then snuggle him, but don't necessarily nurse. But, personally, I'd wait until he's a least a year.