My top three are: readiness, support and efficiency.
Readiness has to do with being ready even if you don’t know what you have to be ready for. There’s such a fast rhythm around the office with shoots going on that there can be last minute requests and you have to be ready for it. Whether it is having full batteries for the camera, or being able to jump on a quick edit change, be ready.
Support is related to always being able to help and have an input on anything. As a tech assistant you know everything that is going on in the office and therefore you should always be ready to support whoever needs it.
And last but not least, efficiency. Swift solutions in an everchanging environment is crucial. The quicker you sort things out, the quicker you can move on to the next challenge. But remember, it is not only important to do things with speed, but do them well!