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Your coding should only get overwritten if they need to re-code or update the software on any of the ECU's you've coded as part of the service.
Generally, this is only done for recalls or to fix specific issues you are having and not done as a matter of cause due to the time it takes, so you should be okay.
Providing you follow the steps for doing the coding, it isn't particularly difficult to achieve. I am more than happy to show how to do it yourself when we have a get together. All you need to purchase are the cable and a token, everything else can be obtained for free and then you can redo the coding at your leisure.
FWIW, my car is in next week for a faulty parking sensor, so I've removed the visible changes I made prior to taking it in so as not to draw obvious attention to the fact it's been coded.
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