I have some vision, but this is something I'd never thought of before and I was curious, so I just tried lighting a candle with my eyes closed and it was ... pretty simple? I have one of those longer lighters and I Just felt around on the candle until I found the wick, held the lighter next to it and lit it. Then I turned the lighter off and checked for heat to make sure it was lit.

There's long fireplace/grill/wood stove lighting matches that I imagine could be useful, they're roughly the size of a chopstick and burn slow, so I'd think most blind people could light one of those and then poke paper or whatever with it to get it to light audibly.

I've also used grill lighters, the kind with just a trigger, and you could definitely light candles by putting the business end against a wick, clicking it, holding for a second just in case, then checking for warmth.

Personally I had a very close call with a candle a few years ago - the glass container it was in shattered from the heat, it fell on to the carpet which caught alight, I had to pat the fire out with my hand because I couldn't see how fast it was spreading and judge whether I had time to fetch a wet teatowel. I had cuts and burns on my hand and although they healed pretty quickly and I know the same thing could easily have happened to a fully-sighted person, I really don't feel comfortable around candles and fire anymore if I'm on my own.

I still use the gas stove no problem though. And I smoke, so lighters are fine.

Use one hand to know where the candle wick is and the other to light and hold the match. Light the candle on a stable surface so it doesn’t fall over. Or light a candle in a small holder and use that to light other candles. Make sure you know where your lit candles are so you don’t knock them over or leave them burning unsupervised.
For a bigger fire, arrange your wood first and make sure it’s set up so it won’t collapse later and spew sparks all over. Put your tinder in the bottom center of the wood pile. Use a long match or stick or any match, honestly, to light the tinder and pull your hands back.
Understand the difference from your fingers getting a bit hot vs burning yourself and train yourself to never drop a match. And always have your sleeves rolled back and long hair tied up or pulled back.

I recommend using a wax warmer. The scent is much stronger from a wax warmer and puts off heat and light just like a candle, but it’s much more dangerous.

This is a difficult question to answer, because everyone's level of blindness is different. I DO know people who are completely blind who can light candles. Or a gas stovetop.....

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Fire can get away from someone quickly. Someone who is sighted also. I can only think to tell you to get a LOT of smoke alarms... And maybe some of those long nosed lighters?