Okay, sorry for the delay.
My advice is don’t take any pictures during the eclipse. The eclipse is a fleeting thing as it only lasts about 2 minutes and you want to enjoy it. I want to make clear that I am an astrophotographer, I have actually taken pictures of partial eclipses before, and I will not be taking any photos. Just enjoy the moment. The problem with taking a selfie is you will be taking your eyes off the eclipse. You do not want to be staring at your camera.
Most eclipse photographers I know practice for months ahead of time and have everything automated.
If you insist on taking a picture, know that the exposure is going to drastically change between partial and complete. You’ll have to compensate for that.
Let me tell you what I’m doing. I am setting up binoculars on a tripod, and I have solar covers for the binocs. I also got eclipse glasses (link will be below). My plan is to set up my binocs with the solar filters on them, point them at the sun, and watch the partial eclipse through the binocs. Be careful not to look directly at the sun with the unaided eye. You might even want to put a cardboard shield on top of the binocs to protect your eyes.
I will be wearing an eye patch. That way one eye is dark adapted. At the moment of totality, I will be taking off my eclipse glasses, my eye patch and taking off the solar filters off my binocs. I will watch the eclipse both with the naked eye and through my binocs.
Here is the link
https://www.rainbowsymphony.com/eclipse-glasses/
The plastic glasses (not wrap around) are the ones I got. They fit over my regular glasses. I also got a bunch of paper ones for people around me. I also got the paper card eclipse viewer that I am going to fasten to my binoculars.