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Just like arthropods do now:-http://www.uncommondescent.com/evolution/trilobite-caught-in-act-of-molting/

Complete thread:

Trilobites David Turell 2014-03-04, 02:38 PM
- Trilobites: molting fossil David Turell 2015-09-29, 12:04 AM
  - Trilobites: molting fossil David Turell 2017-03-02, 02:02 AM
    - Trilobites: gills on legs David Turell 2021-03-31, 07:35 PM
      - Trilobites: spears to fight David Turell 2023-01-16, 08:42 PM
        
        Trilobites: latest complete fossils David Turell 2024-06-28, 03:27 PM
        
        Trilobites: latest complete fossils David Turell 2024-08-13, 02:46 PM