It's actually pretty simple! You'd surprise yourself
2004 Ford Fusion 3 TDCI.
I had the DAB upgrade done today & while collecting, I had a chat with the service technician (mechanic ). He told me, off the record that the blanking plate will flag an error on the ECU & depending on circumstances could put the car into limp mode. He advised also that a poorly manufactured plate would breakup & it would be better to simply bypass the valve altogether. He suggested a Haynes manual to view the layout & work it out from there. Regarding your comment above, he said that if I am able to change a headlight bulb from the instructions in the manual, then the blanking plate shouldn't be any harder, providing I have the correct tools.......Interesting & food for thought.