Well I'm definately no expert & as I've said before every baby is different so what worked for me may not work for you, but I'm more than happy to share my techniques (if you can call mine a technique haha) incase they do help you.

I would give her a nice firm cuddle & a kiss, tell her "its time for you to go to bed now" place her in bed & give her forehead a few strokes while saying goodnight to her. I saw this technique (saying those words to her) on a show... prob Dr Phil or something haha but it did work well for her.

As she got older & started making excuses not to go to bed I have introduced a comfort blankie which she snuggles with a dummy in her mouth aswell. About a month ago she started asking for a book, so now at the age of 25 months she goes to bed with a bottle, a dummy (or 5! So she can always find one through the night), a blankie, a book & a teddy. Sometimes it looks so crowded but it works for her.

She is currently sick with a cold so I have gone back to sitting on the side of her bed stroking her forehead for 5-10 minutes at bedtime & up every couple of hours through the night when she coughs & wakes herself up.

Good luck, I hope something I've said helps you get Evie off to sleep on her own... remember 6 months is still quite young (as you said) so she's still learning too. I think its also great to start introducing a routine for bedtime this way she doesn't know any better & is used to doing the same routine every night, hence no arguements, or fewer arguements anyway, when its time for bed!

GOOD LUCK!