Exchange of shower arm without causing damage?

I would like to install a longer shower arm, I mean the typically slighlty angled pipe that comes out of the wall.

My concerns in more detail:

I can't see past the current pipe and thus don't know if the hidden end of the pipe is possibly attached with an additional nut, seal or other parts that may simple fall down right behind the wall.

Q: Are there some safe steps and tricks to remove a shower arm and install a new one without resulting leaks or other mistakes?

submitted by /u/PiLLe1974
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from DIY https://ift.tt/367W6fd