How to replace sticking ignition key tumbler 1997 Chevy truck?

1997 Chevy 4x4, key is well used, won't even turn to acc'y hardly! How do I replace the tumblers and enjoy the benefits of radio and ease of being able to turn key without a LOT of jiggling? Thanks|||just remeber..u wil have to change door locks if u chance ingntion bar..id say ur key is just wore out nout ur ingntion bar..|||look at the key. the key teeth might be worn too much or you could try spraying the ignition switch. it might just be dry.|||before going to all that trouble have a duplicate key made at your local lock smith. doesn't sound like a lock tumbler problem as much as it does a bad key