Since it would be impossible to negotiate with a committee the size and diversity of the HoC the Government ie, those in charge at the moment, are appointing expert negotiators to act on their behalf. There has to be trust that these people to do their best for us as a nation. Mrs May has already said that the final say as to whether the final agreement is accepted will be put before Parliament. So what's the problem? Of course if Parlaiment says no, we could, as I understand it, when the two years is up, then leave with nothing. So I hope ample, very ample, time is allowed for debate!!
(I still think we'll end up staying in)