I can see why it sounds fun. 40 pages later of dense schematics that you're desperately trying to match to what you have on your desk you'd realise it's 90% frustration and 10% headache. It's like navigating a city with a map showing cracks in the pavement split into 1000 individual one page puzzle pieces and written in Chinese (sometimes literally). God forbid someone made some modifications along the way at which point you might as well call it a day and bugger off to the pub. Now THAT last bit is actually good.