There is no way to heat all the joints at once. You will have to do them one at a time, and there is no way to tell if there is play in the pipes without seeing the installation. You will just have to heat the connection and see if it will come apart.: In attempting to replace a shower body, I will be attempting my first-time pipe soldering job. Is there any play in the pipes, so that when I heat up the joints to remove one pipe, the other pipes can be moved out of the way? Or do I have to heat up all the joints and remove all pipes at once?: Thank you.