Hi WireWisper,
Best Plan: Work de-energized only.
If Not Possible:
Check NFPA 70-E.
Its sole purpose is electrical workplace safety. There are lots of words about work wear.
Also note that not all rubber gloves are suitable. All rubber soles shoes definitely are not- only some are. All plastic hard hats are not necessarily safe. All flash helmets and goggles are not necessarily suitable.
I worked as a linesman years ago, usually on 310,000 volt transmission tower lines. Our work wear was very specifically designed, tested and certified. Many sources of certified gear are on line and in stores. Grianger and Zoro (a Grianger daughter company) have a good selection.
Stay away from imported gear with certifications that may be faked. Go name brand only.
AND...
Test your equipment before every job. Purchase an inexpensive meg-ohm meter for quick testing. (Match the tester voltage to the range you're working on.) I am an electrician usually working to 13,200 volts maximum, but I test my gear daily when working live at any voltage. It's required in many job sites.
AND-
Do Not Trust Rubber Gloves & Plastic Handle Tools Unless Listed As Insulating!
Paul