Then finally add a smiley you are partial to:

buzfap01$02%014STK1456cAonImA;)

and perhaps a lucky number as well.

buzfap01$02%014STK1456cAonImA;)7

Even at this stage my guess is that we are at a level of pretty safe entropy (provided you have not followed my formula but instead created your own).

Such a passphrase is not so difficult to learn (but does take time). So I think that most people are capable of creating a brainwallet but I think it will take them some time to develop it (but if you really care about your investment you'll spend the time to protect it).