No need to replace them in any order, but like suggested, do them one at a time, i.e. disconnect and reconnect the cables before moving on to the next plug. That will prevent mixing up cables and that can be mess if you do.
Keep in mind, the ignition cables do wear out, with use and time, replace them when the OM says to do it. If you've only put 30k miles on a vehicle in 5-6 years, cables may wear out before the 30k miles.
Have a helper start the motor while you watch it, in the dark, see if you see sparks leaping from the cables, if you do, they are past worn out, replace them.
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