The party controls everything, but they put the bulk of their power into controlling their citizenry. Each house has a telescreen, the thought police lurk everywhere, and there's a whole underground system whose only goal is to take out dissenters of the party. It's not even just on the surface level; they've invaded the family unit, religion, and romantic feelings- all things that could possibly be held over the party. In doing so, the party becomes everything that people can look up to. Things like the daily hate only add to their power
People are actively working against their own self interest because they know no better, and this shows that the massive effort by the party seems to be working. They've internalized the surveillance, and expect it to be present even when it might not. When Winston meets up with Julia, he's scared of microphones in the bushes, which is a totally crazy thing to expect in the normal world. Still, they both knew that at some point they were going to be caught.
With the implementation of newspeak, all possibility of insurrection would be crushed, because the mere idea of rebellion isn't a word.Take away the ability of mass communication, and any adverse ideas can't spread.