Originally Posted by zeonstar
1. Do calibrators do anything to the other devices in my system, such as my AVR or 4K player?
2. Most importantly to her since this little hobby of mine is so expensive, After they calibrate the tv, if I later replace my Blu-Ray player or AVR, do I need another calibration?
1: As I indicated, it's not mandatory, so it depends on the person.
I am personally willing to help with literally anything (within reason) while I am there and have the time but the next scheduled appointment (if any) always has priority over these secondary things. The only mandatory step is making sure the TV was calibrated properly.
For me, the final evaluation usually includes looking at some content through the user's source device(s) which includes making sure those source devices are configured properly. However, it's not really my problem unless we specifically included similar extra terms in the unwritten "contract".
So, I suggest you talk about this with the person of your choice in advance. They will probably agree to make this a mandatory step, probably at no extra charge (or very minimal fixed tip on top).
2: Generally no. I personally never use the client's source device(s) for the calibration (ever since this was made possible for me). When somebody asks me to do so I explain my reasons and I simply refuse if they insist (no matter what, they could offer extra, I don't care). And even then this shouldn't matter unless your source devices are faulty in some sense (for example they have software bugs which disturb the image quality).