Most Ford doors are a simple enough process. Although not familiar with the Galaxy specifically, you will likely find that the lower portion of the doors grab handle (underneath the window switches) the bottom half can be removed with a trim removal tool, spatula, or protected screwdriver. behind here is ordinarily two 10mm's bolt or around that size. remove these. Also, the plastic trim around the door handle can often be removed as well, so that would slide out. If there are any screws or bolts under there, remove those.
To remove the door card, you need to pry the door card away from the door, then firmly pull it away from the door. You will likely need to replace the door fixings (couple of quid off ebay) when you go about reinstalling the door. I had to do this after removing them from my CMAX.
Then you can do whatever work you need to do and reinstall is a reverse.
When you say that its loose, what exactly do you mean? it "wobbles" before it actually starts to really pull the rod top open the door? if so, you might find that you need to replace the door lock rod.