I'm not going to be exhaustive, but you have all of the training that goes into all the jobs you had before you were promoted to that level and all the cases that you would have dealt with.
There is a guidebook, which you're familiar with, called “Open and Accountable Government”. That was first made transparent by Prime Minister Harper and has been made transparent by prime ministers since. There's a fairly detailed infrastructure of training for senior officials and deputy ministers in specific issues. In most big departments, you have a legal services shop, and you have people you can lean on for advice on specific issues.
In the Privy Council Office, which is sort of the secretariat for the cabinet and its committees, there are people in the legal shop and in the cabinet operation shop who are very well trained and familiar with the case law, the practices and the examples that have come up. You do end up leaning on them for advice.
I can assure Canadians that it is a responsibility that's taken very seriously. It is part of the role of the secretary to the cabinet, an office that has existed for centuries. I'm not sure that there's any other way to do it.