Hello and welcome, I sympathise with you as Dora has sharp nails and I end up wearing thick Tshirts even in the heat, and luckily I have thick hair.
If you look at the menu bar you will see "search forums ", and you will find that people often choose to use textured perches and chewing toys to keep beaks and nails trimmed. Other than that many people take their bird to the vets for this to be done.
As far as chewing cables etc goes you are probably best off hiding or wrapping all cables etc., and have to be very vigilant!
Does your bird respond to a form "no" , somehow my husband has managed to get Dora to stop doing things when he says "no" in a certain tone of voice. Maybe the training pages will also help. Others will be along to respond to you too.