To avoid confusion: That camera is of that kind that first winds the film completely onto the take-up spool (Pre-Wind) and then draws it back into the cartridge a frame after each exposure.
You should be able to open the back door after exposing the last but one frame (which you left unexposed), but then the leader would still be on the take-up spool. Dependfing on type of camera taking it off could be a problem.



But anyway, cutting the film end before loading the film onto the processing reel is no big issue. You don't need a guide or such. Just make a straight cut, then cut off the corners to make it more easy to lead the film through the spiral. If you feel a "nasty" open perforation, cut it off.

If you feel insecure, use a pair of scissors with rounded peaks or round them off yourself.