Do you have the proper tools ?
- Get them.
When you have the bike on the central stand it will tip over towards you when you try to unscrew the right nut, and you will lift the bike when you try to remove the left nut.
>>This is normal.<<
If you feel hesitant - cut the nuts!
Be careful not to damage the threads though.
Riding in salt and sleet will get these nuts stuck real bad -
When the nuts oxidize stuck - you will ripp the threads if you attempt to unscrew them!!! And to fix such damages is far more expensive than just cutting the nuts.
When you reinstall these nuts - do lubricate them, generously, with Omega 99 (or equivallent 1000-1200'C paste). I know people recommend cupper-slip/paste, but that will not last even one winter in the salt and sleet (+/-0'C to -8'C).
Lubricating, and heating prior to an attempt to losen the nuts - is an obvious precaution (I have never done it though).
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DO NOT use poly-plier(? english term/word?), chissel, or any "inventive" gadget - in such a case you do better by cutting the nuts!
ONLY Use the proper BMW "claw" or a fair pattern -