Mostly for future self reference, but also in case somebody else wants to do something similar, I'll write down the steps I took to do my selfie time lapse video.
First step: take daily pictures. I recommend about 0.3-0.5 seconds per picture in the slideshow and you want to have at least 30 seconds of video, so that means at least 60-90 photos. Pro-tip: do them in as similar way as possible every day. Especially the distance to the camera is important. You'll thank me soon enough.
After you gathered all your pictures together, you want to align them. I did this in GIMP. You open the program …continue.