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Do the whole thing outdoors, and retire indoors while waiting
Will do
Swirl, don't shake. The last thing you want is to break the container while agitating and douse yourself
Noted
Put a pin-hole in the lid for pressure relief as the vapour pressure of CH2Cl2 is nearly half a bar at room temperature
Will do
Do it overnight when the ambient temperature is lower to avoid boiling off your precious cancer juice
Can't promise that one, I'll put it somewhere cool though (my garage?)
It should work, but could be improved.
Of course, my primary recommendation would be to not use CH2Cl2 at home, it's restricted for a reason.