Not so difficult!
SOME GOOD NEWS fellow "Opti-nuts"!
You DO NOT have to take the rear bumper cover off to remove the lower cover that holds these lights!!!
All you have to do is remove 3 plastic retainers from the bottom, remove 2 screws from each side, then work the 2 lower tabs loose on each side (these are the largest tabs on the lower cover), and then carefully pull out the 8 smaller tabs along the top of the lower cover (pictures to follow as we take them...). LX and EX models will also have to remove 2 plastic retainers from the bottom cover on the left side - SX and SXL models do not have this cover -- they have a muffler instead...
Once you remove the lower cover you can take out the reflectors and replace them with the repeaters.
Install is easy...just reinstall the 8 tabs along the top, reinstall the 2 tabs on each side, put the 2 screws in on each side, and then reinstall the 3 plastic retainers on the bottom.
Wiring the lights is another subject...