Tape? Always good to have some tape stuck to a clean surface or such when shooting 120 film. Sometimes the sealing tab gets torn or won't grab, another use.
Also, maybe you did this, but remember htat you can get the paper attached to the take-up spool before it is trapped in the camera. You can also attach the spool, get it in place, and then insert the film spool into its chamber. This can give you more room to get things in place (but yeah, gets tricky to get everything in the camera with only two hands).