Re-keying door locks?

[foxxinabox at wideopenwest.com (Foxx (in a box))]

   there are two options if you want to rekey a lock to the door. if you 
happen to know the four digit code to your key, i have a book that 
breaks down the code to know what tumblers you need. if you don't have 
the code, then it's simply a matter of matching the tumblers to your 
key. the process is not difficult at all and you could save yourself a 
bundle by doing it yourself. plus by replacing your tumblers with the 
correct one instead of filing them down your are keeping your car more 
secure from break in. if you need specifics on this or that, let me 
know. i have god knows how many tumblers, door locks, etc. that i spent 
a whole day cleaning not long ago.

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