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I too have a BSM E90 and I dove right into it without practicing on another car. I did learn some valuable lessons along the way. The most important is to put a black mark on your backing plate so you can see your pad spinning as you polish (I too have a PC DA polisher). Second most important thing is to never go higher than speed 6. 5 is plenty fast. 6 won't do much better.
Good luck!
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