I think the big advantage we've got in England is that other leagues are already doing this. It's in Serie A and MLS, where Howard Webb is heading up the video referee side of things. That's experience that, hopefully, the FA can learn from.
Some of the stuff that VAR is being used for is fairly black and white. Whether a player is in an offside position (whether they're actually offside can be more opinion based), or whether there was actually contact for a perceived handball or foul for example.