"Appear to hold the belief which appears common amongst Brexiters"! Well, from that, it appears to me that you appear to have no idea what I believe.
However, I will agree that neither party had a plan, mainly because those in power believed that a no vote was forthcoming. Initially, elements of the UK Gov foolishly expected to get far more from the EU than was going to be given from the more belligerent elements within the EU.
Then again, there are no exit plans or arrangements set out in the Treaty of Lisbon, anyway.