Editing 360, stitching shots together

Hi everyone. I just got a Ricoh Theta S and I finally understand how to import the stirched files in Premiere. Now it's time for phase 2 and I'm kind stuck. What I'd like to do is, basically, record four takes: for every take the camera will be in the same position but I'm gonna be at a different angle (front, 90 right, back, 90 left): what I want to do is stitch the four movies together so to have a 360 movie in which I'm there 4 times. I know it can be done cause I've seen it online, and for a normal video it would be easy, with some cropping. How can I do it in 360 ?

Thanks a lot