I've spent around 40 hours in 3 days working on my car - paint correction and then ceramic coating. My best friend is a detailer so he taught me a lot of things and how to use polisher, etc; it's not a rocket science but you have to know what you are doing. If you are already doing paint correction then you should do ceramic coating immediately - prep for coating is also a process. I'd suggest to do it right and pay someone but if you would like to learn the skill I'd ask the detailer if you can stick around and learn from him. While BMWs have solid paint and lots of clear coat there's still a possibility of burning thru the paint which you do not want at all.
Hope this helps!
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