My husband and I bought a home in north central Ohio about 1 1/2 years ago, originally built in the 1890's with significant additions made around 1920. While the home passed all its inspections and even has a brand new breaker box in the basement, it seems as though nearly all the peripheral wiring in the home is still knob and tube. I have done basic replacements (light fixtures, light switches, etc) on modern wiring in the past, but put on the brakes when I saw that each one of the items I wanted to replace in our new home has old wiring right up to the fixture. Do I need a pro any time I want to replace something? I have some super ugly 1950's light fixtures that need to go, but I don't want to mess up when it comes to electrical! Thanks in advance for the guidance.