You're talking the 2500 series, I assume. I have no trouble loading it without the gizmo. In fact, it was the Jobo distributor himself that dissuaded me from getting it. Particularly if like me you're doing it all in a changing bag where real estate is at a premium. Great tank.
On the other hand, I would seriously consider getting at least the rollers if not a processor as it cuts down on chemical use alot.
Final word, start with loading only four sheets rather than all six - easier to find the right slots and more forgiving of imperfect agitation.