Hi, I'm a BF peer supporter at my local BF support group and I agree Jenijena. If you can get to a group so someone can see what you are doing it would be really helpful.
Some tips I can give:
Make sure you are relaxed and comfortable. Have lots of skin to skin cuddles, without pressurising yourself to feed her, just enjoy the cuddles. BF relies on oxytocin (the happy hormone) so everything will work better if you are relaxed.
What are doing right now wrt to positioning Have you heard "tummy to tummy, nose to nipple"?
When you are ready to feed her, hold her very close, turning her whole body towards you.
Wait until baby has a really wide gaping mouth then, moving quickly, latch her on. She needs a big mouthful. You shouldn't be able to see any of you areola below her mouth, but maybe able to see it above her mouth.
If it hurts at all, take her off and do it again. This can be frustrating, but you need her to learn how to do it right.
One thing I will say, is that mix feeding this young is not recommended as it can cause nipple confusion. I appreciate you are concerned she will not get enough milk and I wont recommend you just stop but I will be honest and say that bottles (at the moment) wont help her learn to BF long term. How much time do have to spend at this right now? Do you have other children to care for? Do you have someone at home who can do everything else around the house, bring you food etc, so that you really focus on this, enjoy the time with your newborn, stay in bed and have as much skin to skin as possible? It can make the world of difference.
Sorry to bombarded you with questions!
Has your milk come in yet? The more you feed her the more milk you will make so feed her as frequently as you can (its the frequency not the length of time spent feeding that matters) to stop you running into supply problems.
Some women find it helps to express some milk onto the nipple area to tempt the baby on.
I hope that helps a bit, or is a start at least.
The Le Leche League are said to be very helpful and have a website and I think have a helpline too.
kellymom.com/ is helpful too.
Good luck!