OJ, this is one method for choosing a PIN you will have no trouble recalling. Think of a favourite word. One that perhaps you associate with spending money. Could be wife eh? Or maybe mistress
Any word or pet name that will immediately come to mind. A 4 letter word is good but a longer word will do if you remember whether to use the first or last 4 letters.
Now using the chosen 4 letters look at your phone keypad (and of course you will always have a phone with you) mentally hit the letter keys and convert it to numbers. Example: floozie last 4 letters = 6943
Another way is to chose the day and month of an unforgettable occasion, like your wife or kid's birthday, or your wedding date..... hmmmm, no, that last one won't work
Use leading zeroes if single digit thus 25th of July would be 2507. You could chose to reverse that to 7052. Of course don't use your own birth day/month or anyone's year as that could be known