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In some cases, the answer is yes. Being licensed to work on gas lines requires additional specialized training beyond being a licensed plumber. If the plumber is also licensed as a natural gas plumber, they will be able work on natural gas lines. If the plumber is only licensed to work on water and sewer lines, then you’ll have to find another professional to do gas line work.

Costs depend on furnace size, ductwork modifications, labor, and efficiency ratings of the chosen system.

No, you shouldn't cap a gas pipe with a compression fitting because they aren't designed for gas lines and can pose serious safety risks. Gas pipes require threaded caps that create a secure, leak-proof seal capable of handling gas pressure. Using a compression fitting could lead to dangerous gas leaks—a hazard you definitely want to avoid. 

In most cases, yes, it’s safe to light a gas water heater manually, but you should shut the gas off first, open a window, and let the space air out for about 10 minutes. Modern water heaters shut the gas off entirely if the pilot light goes out, but airing out the area beforehand is good practice and will ensure it’s safe to relight your pilot light manually. Just make sure you turn the gas valve to “pilot” before lighting. If the light keeps going out or won’t light at all, call in a professional.