Interesting thread – I'm new to selling vintage too – after many years of buying ;-)
I made a small webshop about 8 months ago, so I sell for fixed prices and sometimes really have a hard time pricing things. I've learned some lessons too during my first time, but I try to think of it just that way – as a learning process.
I think now that how quickly things sells is a good indication if I got the price right – if it sells very, very quickly, I tend to price similar things a little (or a lot) higher next time. (like a gorgeous green Marimekko 70s jacket/blouse that was gone within 12 hours

And retro-textiles that people use for sewing, and that initially sold at a pace that I just cold not keep up with. Now a little more expensive and a little slower, but not too slow))
If an item does not sell/sells very slowly, but I can see that people watch it/visit the item, I consider lowering the price of similar items the next time.
Also, I have stuff with a very small price because I like the idea that my customers can find a bargain among pricier stuff . Ususally I also have a few more expensive designer stuff (mostly scandinavian silver jewelry) that is quite sought after, and that I put at a high selling price. It may take some time to sell, but I can see that it generates traffic to my site, and not so seldom a visitor will become a customer buy buying something completely different than the item they googled and found my site through. As jewelry doesn't take up any room, and it doesn't loose value, I don't mind that it doesn't sell that fast.
That in contrast to things, that you really want to "move": I can totally follow Nicole on the winter coats – have a few of them myself and they take up a lot of space, so for winter I will price them quite low and just try to get rid of them.
But that is a balance too, I guess – I have the hunch that if you price things too cheap, people tend to think that it is of a lesser quality – I had some nice dresses, that I priced too low, i think now – they did not sell! Now I took them of, but for winter I will price them a little higher and see if that helps.
Well, I guess what I was trying to say was: I think that whole pricing-thing is really a skill in itself – that's my lesson until now
Trickvintage, hope you will be able your stuff at prices that make you happy – but I know the feeling !
And thanks to you all for sharing – it is great to hear the experiences form others – experienced as well as inexperienced sellers!
Now off to watch the world championships – have a nice weekend
Sille in Denmark