YWatch the wiring for the motors.
On the Duet, the wires of the motors are A-A-B-B so two wires of the same phase next to each other.
Most motors I have seen use blue-red and green-black as pairs. If you are not sure, use an ohm meter or just short circuit two wires of the motor - if moving the motors by hand start to feel more difficult those are two wires from the same phase.
O - of course do this with the wires not connected to the electronics and the printer switched off.
So if I'm understanding it correctly and I buy the Duet Wifi board with a Paneldue I'm pretty much set to installing it
Yes - I just bought a Duet Wifi and a PanelDue with 5" LCD for a printer that I converted.
If you want to use the SD card on the LCD module, you also need a 10-pin ribbon cable.
Note that if you want to upgrade to a thermocouple or PT100 sensor in your hot-end you also need a sensor and the matching daughterboard.
Wiring and configuration is a piece of cake, I got my printer printing after a day or so.