This is quite easy. You can spot the large C shaped clips on the top of the lense, there are also a couple on the bottom, once these are all released it can be pulled right off. To get to the bottom ones, the body colored fillers below the lamp unit are removed. If there are headlight wipers, take these off first.
Then the screw on the inner part of the filler is removed, then the outer one, which is accessed by removing the turn signal lense.
After the filler is removed and the rubber strip pulled out of the way, you will see the other C clips on the bottom.
When installing the new lense, just make sure the long indexing pins are aligned with the recesses in the headlamp body, then push it in and make sure the C clip snap over the notches in the headlamp.