Let me see if I can use less than 1,000 words to paint the picture.
Assuming you're right handed, first make sure the little step created by the end of the spiral is facing to the right. Break the seal on the paper backing, and pull off a few inches of the backing so you have about 2-3" of film free, holding the film spool in your right hand between your little or ring finger and the heel of your palm. Cup the film slightly between your index finger and thumb - just enough so it will pass between the spirals.
Holding the reel in your left hand, thumb and ring finger in the opposing center openings, rotate the reel until you feel the retainer clip with your left index finger. Then, guide the film to the underside of the retainer clip, lift the clip slightly with your left index finger, and slide the film underneath the clip. You can feel that the film is centered under the clip with your left thumb and ring finger. Make sure the film is square to the center sprocket of the reel. If not, you can adjust that easily by loosening the tension of the clip slightly as you reposition the film.
Once the film is secured under the retainer clip, start rotating the reel counter-clockwise to load the film. Keeping your right thumb and index finger on the edge of the film, you can maintain the even curve by resting those fingers of your right hand on the outside edge of the reel. As you rotate the reel with your left hand, just allow the spool to rotate in your right hand as the film is pulled from the spool. If you lose control of the spool (held between your right pinkie and the heel of your palm), no big deal - just let it drop toward the floor. Unless you're really, really short, it won't hit the floor. As you load the film onto the reel, you can feel for any kinks or misloading with your left index or middle finger.
Once you come to the end of the film, where it is taped to the backing paper, just rip the tape and fold any excess tape over the end of the film. At this point, you should be at the outer-most spiral of the reel, and you should be able to feel an inch or so of space between the end of the film and the little step of the end spiral. Become one with that space difference (Grasshopper), so you can use that as an indicator of the film being misloaded - if the film jumps a spiral, the end of the film won't be in the same spot.
Sounds complicated, but it's really (reel-ly?) quite easy. Some people have an easier time by keeping the edge of the reel on the counter top.
Wow. I did it in 484 words! 