It's not easy, that's for sure. I'll show you the file, then try to explain the steps ...
Download the PSD
The strategy is to fix the easier (camera right) eye first, then copy that over to the other one.
So first, I duplicated the Background layer and liquified the wayward lash down. Then added a mask to that layer to meld it in as best as possible.
Then added the two layers of the Handyman Method, and very patiently worked to put the natural eye crease back in, and generally make everything look plausible. This took ages, don't rush it.
Once I was completely happy with that eye, I added a new combined layer above all the other layers, by hitting Ctrl Alt Shift E. Then I flipped that layer horizontally, and converted it to a Smart Object. Then rotated and moved it until it roughly lined up where I wanted it. Then added a mask, and masked it in.
That copied section was a bit too dark, so I clipped the Levels layer to modify it a bit.