So I decided to make some slight modifications to my three Blythe dolls. On all three, I changed their eyelashes, and on two of them I replaced some of their eye chips. Previously I had opened their heads to remove their faceplates, but figuring out how to remove the eye mechanisms and change the eye chips was not easy!
I soaked the eyeballs in warm soapy water for about 10 minutes to loosen the glue, then used the hot glue stick method to remove the chip. They came out with no problem. To remove the eyelashes, I also soaked the eyelid mechanism in warm water, and pulled them out with tweezers. To stick the new ones in I used a sewing needle to poke them into the eyelash slot. Very tedious work!
With this particular brand of eye chip, I didn't realize that I had to paint the stub of the chip in order to get a black iris.
My third doll still needs to be sand-matted, so I'll add pics of her when she's done. Here is Penny and Margot with their new eyelashes and eye chips (clothes made by me):