I have been the handy man for the family rental properties for several years. I replaced a renter's toilet yesterday, took about 30 min, if that. I have done it so many times that I know the tricks and now don't get water and wax everywhere.
Most electrical work isnt that hard, as was said earlier. Use a tester, shut off the main breaker, follow basic code. When connecting wires with wire nuts, don't twist the wires first like everyone I have ever seen do it. The wires go into the wire nut side by side and the wire nut does the twisting. Secure with tape. I am yet to once take apart a wire nut that was installed correctly. Everyone twists the wires first and no one tapes. Stuff like this helps prevent a fire.
Gas is about the only thing I don't mess with. It is a pain to find someone to do that work, because the insurance is so expensive. When you pay a pro, you are paying for insurance coverage in case they blow up your house.
I would encourage anyone here to ask for help if you want to learn, from everyone not just me. Post a pic if you can and describe the issue, and someone can probably steer you in the right direction.