How do you un jam the sliding sun visor on VW Beetle?

I just repaired my sunvisor. You have to buy four new guides for the sun visor. It cost me $75.00 Cdn. from the dealer.You have to remove the sunroof. With it tilted up there are three screws on each side. After the sunroof is off you can jimmy the visor forward to take it out and put on the new guides. I set the visor on and put the guides on in the track on one side in then the other side. It is a tight fit. When you put the sunroof back on make sure the tilt is down to position the glass properly. It took about an hour to do.