After editing and saving a yaml, do I need to reinstall it to the device, or does saving it do the trick?
You need to reinstall it. Think of the yaml as a set of instructions for creating the device firmware. The firmware needs to be compiled and then loaded onto the device.
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if the device is already on your network, this is easy to do by wireless (OTA)
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You must have the OTA option enabled in the original YAML though:
ota:
password: "aaaabbbbccccdddeeefff"
Otherwise add it and upload the firmware manually (USB cable) and then you should be able to perform OTA updates after that.