"JFDI?"
"Just Flipping (to avoid the censors) Do It" Eddie.
I think the frustration shown by many wishing to see the UK's swift exit from the EU is that, continually, our leaving seems wholly dependent on the successful conclusion to the negotiations on our future relationship with the rest of the EU (which the "deal" is about). This ain't necessarily so.
I think the UK's negotiators will find (when their negotiations get under way) that it will be impossible to unravel ourselves completely in a short timescale. But that should not prevent our departure, see the end to our payments and the end to our being subject to EU influence and control.
The act of leaving is not dependent on the success (or otherwise) of the negotiations and there will be quite a time when, in all manner of things - including trade, the UK will have to behave like all other normal (i.e. non-EU) nations do.