Also, never machine when tired, it's just to easy to jog in the wrong direction, fast feed the tool into the part in Z instead of jog etc etc.
As said previously, dry run everything (blobk by block if you can) and cut air for the first run to make sure the tool goes where it should. Again I agree with the feedrate overide comment- get ready to rack it down to 0% or have your hand over the E-Stop.
The fact that you're addressing the problems is good. Good luck!
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