Depends on how deep you want to get. You could prep the device without breaking it down by taping and covering all things you don’t want painted.
If you remove the 4 screws from the back of the panel, you will expose the keypad and fingerprint reader boards. You can gently remove those then will have only the face plate to paint.
Not terribly hard I imagine, but I would highly encourage that when re-assembling you ensure everything is flush or your will most likely lose your IP rating. I would also say, in doing so will void any manufacturer warranty.
@spamoni did a really nice rework job with the Wyze Lock and Keypad may be able to offer some pointers even though a different device.