The best way to understand monads is to stop reading monad tutorials and write some code. There is only one particular trick to learning monads: use the >>= operator rather than do notation until you understand the basics. Then read this explanation of do notation:

http://en.wikibooks.org/wiki/Haskell/do_Notation

Actually, this is just a special case of a general rule: "The best way to understand {{programming_concept}} is to stop reading {{programming_concept}} tutorials and write some code."