Self portraits can be taken many ways. Some methods are easier than others. Normally I would place myself in front of a mirror (as seen in other images), focus the lens and snap the photo. Other times, if I'm up for it, would be to set the camera on a tripod and compose my photo and set the camera on a timer if the camera has such a setting but most of my film cameras are manual so they don't have such an option. The other way, which is the more popular way these days for many people, is the "selfie" method in which you basically just turn the camera around and snap the photo. For film shooters, if your camera doesn't have an autofocus, this would be problematic and the other factor being that after you take the photo, you're not able to immediately see your result so you're hoping you got the shot.
I took this photo with a Fuji Instax 210 camera with the selfie method and one of the cool things about this camera, other than the fact that it shoots out instant film similar to Polaroids, is that it has a mirror adapter that you stick on the lens which faces you, allowing you to take a selfie. How cool is that? It's probably one of the reasons why the Instax format is so popular with young people who like the old instant film look and don't have the photoshop skills to reproduce it on a computer.
Which you shouldn't. Because that would just be ethically wrong.
"Selfie" / Fuji Instax 210 Wide instant film / Circa 2014