Tony Blair has done what every employee should do after leaving office: he's left a short note - or in his case a YouTube video - to help the next person to fill his post. It's a bit Dave Brent, but quite revealing for wannabe future PMs.
Lesson one: the key to coping with a demanding and unpredictable job as leader is to "compartmentalise". After all, you never know what's going to be thrown at you, sometimes literally (purple powder in the Commons chamber has been known).
Lesson two: the half-hourly weekly prime minister's question time is your opportunity to "mug up" on all the things going on under your watch, 'fesses our candid old-timer. And there we were thinking he knew it all off by heart.
Lesson three: get the "facts, facts, facts" behind you and not much can go wrong.
Lesson four: be prepared to work around the clock. "The hours are very long and probably not lawful under some working time directive or other," quips Mr Blair.
Lesson five: be prepared to be caught out by the enormity of the role at first, because nothing quite prepares you for it, not even being opposition leader (David Cameron take note).
Mr Blair also found time to feature in another video posted on YouTube, themed around the weekly prime ministerial meetings with the Queen.
If you want to watch a rather cringeworthy bonding session between Blair and Her Majesty, have a click. Also featured is John Major, the former Tory PM, who is rather more revealing than Blair about the nature of the chats he used to have in the early 1990s.
You can tell her absolutely anything you like, even your personal problems, says Major, a bit too knowingly, because it is a truly private affair, with only the Corgis listening in.
And they know how to keep their mouths shut.
