Helm, an auto
service manual publishing company going way back sells the official Ford
Service Manual for the Fiesta. To find it go to Google and type "helm ford fiesta manual 2019" and you will get a direct link to that manual. Note, for the model year type in the year of your car at the end, I used 2019 because that is the year of my car.
Also note that the manual is NOT cheap and you have to have the CD installed you your computer to be able to use it. Tip here is to install it on a relatively fast computer. Note, a significant slowdown in the response is that all of the files that are accessed are on the CD, so you have to wait for that information to be read. I installed mine on a cheap celeron powered laptop and it is very slow to respond. I'll also note that the only way I've found to get a printed paper copy is to take a screenshot and print that. All this is because of Fords copy protection measures and it is a PITA. There are hints during the install process that the data files can be installed on the hard drive but I am not computer savvy enough to figure out how to do that. I also wasn't able to install the manual on my desktop computer, got an error message that the disk couldn't be found (duh, it's what I used to start the install).
Good news is that every procedure in the manual has links to the pre-stage procedure so if you go into the transmission removal and need to remove the engine or something else previous to the transmission removal clicking on the link will take you there. With the latency caused by all the copy protection you'll have time to thoroughly wash and dry your hands while waiting for the link to open the new section. End result is that you'll know the exact procedure Ford developed for any service procedure and you'll also have your hands clean enough to be able to do surgery during the entire process.
BTW, if anyone who gets this manual on CD manages to get it to operate by pulling in the data from the Hard Drive instead of the CD please post it here. From what I've seen on this forum we have lots of folks way more computer savvy than I am, so that Latency just may be solvable. Note, years ago used to run Autocad on a Ramdrive but that was back in the days of DOS and I have not one single clue on how to get a Ramdrive to run under Windows 10. Another option would be to create an ISO file of the CD and install that on a hard drive partition but that requires software from a potentialy malicious website and using a "gift card" to make the software purchase.