I've had difficulty loading the magazine, the manual from Butkuss is pretty vague. However I found an online resource. Links below. I made a printable pdf of the online source, there is a download link for it - however it is only temporary.
The first link you posted is good, if you follow all steps nothing should go wrong. Best is to understand what is going on in the different parts of the camera for each step. It helped me a lot to remember all steps.
I can shoot 13 frames on a roll of Fomapan with my Kiev 80
After using this camera and getting only ten or so shots due to shutter problems have consigned it to the display shelf. I looked at ARAX and contacted them but a CLA, shutter repair and bright screen plus postage back and forth between UK and Ukraine would cost about £250. Too much for a camera that's really only worth half that.