Hi Arlene ~ It isn't recommended that candles are burned due to the noxious smoke given off by them. This won't "kill" your bird instantly - but who knows what effects on their tiny respiratory system in the long term?
I like "smells" in my home too (pleasant ones!) and years ago asked my AV what I could use that wouldn't be detrimental to my cockatiel - I was told to use reed diffusers, which I use now with my grey.
I can't comment on the plucking though - I have never experienced this - but many, many, members have and will sure be along to comment.
My advice would be to stop using the candles altogether