what repairs are homeownwers allowed to do on gas/electric

I would need more detail of what you intend to do, but in general you can do most anything to your own home in regards to normal maintenance and repair. Be very careful if you intend on do any gas related repair. Some things may require a permit also. The best advise I could give is to ask your local building inspections about anything you intend to do beyond minor repairs. Above all, remember safety first. Don't risk blowing up your home and even worse personal injury.