I'm sure you're right. It is rather misleading when some politicians talk about 'delivering Brexit' or 'getting it done' or a 'clean break' as though it will all be over and done, and we can get on with other (important) things. I'm sure that would appeal to many of us (on both sides of the debate), but I'm pretty sure it won't be like that.Not sure I’d agree with “only” but never mind. It has just struck me that of course Brexit may well not be finished even if a withdrawal agreement is somehow arrived at. There will still be the whole process of negotiating our eventual relationship with the EU so we may not have political peace and goodwill for a long time yet.
As you say a lot of negotiating to come, probably even more complex and detailed for a deal than for just leaving. It might be particularly frustrating for some people if we've left with no deal arranged ('clean break') and then we're back to arguing about the Irish border in order to get any trade deal with the EU (and maybe the US too).