Tim Ferriss is a big fan of Seneca and the Stoics. By visualising (not wishing for) the worst case scenario, you become detached from the fear that it will happen. Once you accept the ability you have to cope, you can approach uncertainty as degrees above something that is acceptable. Freedom is not the ability to do anything, it is the ability to choose a different set of constraints. The ability to walk away. By finding something that you can cope with, that is very simple, you provide a foundation to which you can always retreat. We need very little.