I don't use all of the methods, but one takeaway for me has been the Next Action principle. Sometimes you'll find yourself constantly thinking about one task you have to, but it seems too big/complicated to get started.

It really helps to make a (mental) note of the absolute first thing you could do to further the task, even if it's highly trivial. The Next Action for the task "Write thesis" could be as simple as "Google X to find a potentially interesting topic". Once you do that, you can mentally file it away and stop thinking about it (it really works), and when you want to get started on it the hurdle of actually starting is minimal.