Gas fireplace insert won't light
I have a gas insert in fireplace. The pezio button makes a spark when I push it and the control is in the pilot light position, but the gas won't ignite. I had a repair man come last year, $90, and wish I'd watched what he did. How can I get it lighted? Can I use a match at the pilot light ? Is there anyway to check if the gas is coming in without causing a dangerous situation? What else should I check and HOW? This has been one obstinate stove, seems to be hard to start every year.
I have checked other answers, but did not scan all 100 + pages.