Take things slowly. Pause frequently. Think ahead.
If you find yourself making silly mistakes take a break, clear everything off your desk and only put back what you need. Then take a stroll around the house / yard before getting back to it.
Safety
Ask for help and training if you are going to use a tool that is new to you.
If you can’t receive training from someone in your household, find a different means to work.
Power tools should only be used with supervision and proper protection. “Never work alone.”
Hair up, sleeves, jewelry out of the way and safety glasses always.
Unplug when not in use!
Read labels and instructionson any product (adhesives, paints, etc.) before use. Toxicity or fumes, means choosing a different material.
Avoid melting and burning material like plastics and foams that may create unpredictable toxic fumes.
You don’t need fancy tools to make good, working prototypes. In fact, makers and craftsmen have been devising their own ways of making for centuries with the materials that they have found around their home.