The Paterson work well for me, I have no trouble with 120 format. The key to starting the film is how you hold the reel and guide the film in. I use both hands, and spread my fingers to support the film top and bottom of the starting notch. Once it's a few inches onto the reel, you're home free.
For a Jobo reel, I agree it is more tricky. There I align the starting tabs, and get the film into the groove, then pull it into the reel as far as I can. To advance it, I touch the film to hold it stationary to the reel half, then ratchet that half forward. Release fingers, hold with the other hand and other reel half and ratchet that half forward. It's an alternating of holding and ratcheting with each hand and reel half, so that the film can't go backwards when the reel halves are turned the other way.
Jobo reels also seem to have much tighter tolerances, so to avoid kinking the film I will apply a bit of force to slightly try and pull the reel halves apart as I'm loading. That seems to help.
For a Jobo reel, I agree it is more tricky. There I align the starting tabs, and get the film into the groove, then pull it into the reel as far as I can. To advance it, I touch the film to hold it stationary to the reel half, then ratchet that half forward. Release fingers, hold with the other hand and other reel half and ratchet that half forward. It's an alternating of holding and ratcheting with each hand and reel half, so that the film can't go backwards when the reel halves are turned the other way.
Jobo reels also seem to have much tighter tolerances, so to avoid kinking the film I will apply a bit of force to slightly try and pull the reel halves apart as I'm loading. That seems to help.

