I wouldn't be at all surprised if we have a hung parliament. Theresa May, who should be way ahead, appears to be becoming somewhat arrogant and a bit negative whereas Jeremy Corbyn is saying things people want to hear even if they aren't feasible and is catching her up.
As far as negotiations go I don't think it matters one little bit. We have told the EU we are leaving their club and we make demands without the ability to apply any sanctions if those demands are not met. The EU cannot give in to our demands as that will open the door for other members to try and leave and get the same benefits.
The whole thing is a pigs breakfast!