Just curious to know what way you plan out the maintenance of your beloved machine?

I'd be even more interested to know peoples different ways the approach the same for their builds and project cars?

Do you have it all thought out and stored in your head, written on bits of paper all over the place etc etc....

Interested to know as I'm sure every one has a different approach to what needs doing first, costing, sourcing etc etc as well as what you work you can do yourself.

Personally I have a little spreadsheet for this. Some people I've shown think it's a great idea others think it's very odd so that made me wonder what ways other car nuts approach this?