The method/steps to use a VNA to determine a matching network for a 50 Ohm (or whatever impedance) antenna seem mostly clear to me now. My current knowledge assumes though the transceiver (source) is basically the same impedance as the desired impedance (well, complex-conjugate) of the feed line + antenna. That's the whole point after all, to match them to the transceiver.
What I don't really understand, is how to tune the system when my transceiver is known to have a complex impedance other than the antenna (in my specific case the manufacturer specifies it to be 35+10j Ohms).
Say my source is Zs and my load is Zl. Is my goal then, when measuring the impedance using a VNA, to see Zl when my probe is placed at the antenna in, and to measure Zs when measured at the point of the transceiver? Should the transceiver be connected during these measurements at all? Should it be powered (but not sending)? How does this comply with the general advice of connecting the probe at the point of the matching network?