It shouldn't be too much hassle. If you have so many territories and generals that micro-managing them is a fag, you can probably get away with the odd mistake. If you are hanging by a thread, chances are you won't have much to manage.

One of my tricks is only to build ballistae/catapults on the castle walls only when there is nothing else I want to build in a province. Then, when I quickly scroll through the provinces, I can see at a glance the ones that don't need attention.

As for generals and governors, I tend to be lazy and leave them to it unless a) they offend me or b) a period of peace inspires me to conduct a domestic reform. At this stage I usually keep all my non-general governors around the king, tends to keep them more honest. But in the early stages I keep them too busy fighting to think about dishonesty.