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There should be a c-clip on the back of the cylinder. It probably broke cuz they don't just fall off. As far as the door panel I use a stiff putty knife (cuz thats all I had) and very gently popped the clips off. I only broke one tab that they hook to. Also take out the screws in the door hand/grab handle. Its pretty easy to pop off just be "gentle" is all I can keep saying.
Go get a handful of replacement clips so you can replace right away any ones you break . It is far easier to just put the panel back on with all the clips intact than it is to later go in and replace broken ones.