Open it carefully and naturally. I have tried, and this effect is the best.
I don't know if you bought white or transparent. According to my experience, it is not easy to grasp the time transparently. When the white one is dry, you can prick it with a small fork and then scratch your eyelids.
Contrast: I used gummed paper a few years ago, but the sharp ends will hurt my eyelids and make my eyes cry. I stopped using it later. I have used glue and many brands. I think Zhuo Yan is the best (white), and then there is a green bottle. You should not buy it. It's super exciting. I used it on the first day. My eyelids ached after using it, and my skin began to peel off the next day.
I've used glue for at least two years, and it hasn't turned into double eyelids yet. You know, the so-called "long time" that will turn into double eyelids will take at least five years.
As for double eyelid surgery, if you want to do it, I suggest you go to a professional plastic surgery hospital, otherwise there is no guarantee in other places. My aunt did it in a regular hospital, but not a professional plastic surgery hospital, but a general hospital. The doctor in the ENT department did it in private. It was so ugly. So it's better to go to a professional hospital.
Note: plastic surgery, preferably over 20 years old.