At the breastfeeding class at the hospital we watched a video on "baby led attachment". It was AMAZING.
The babies can do it themselves!
I tried it with my son and since birth we have had an awesome bf relationship.
I find that the more I "help" him latch, the harder it is for the both of us. So I just let him go for it.
When we were first learning, I found that if we would start to get a bit frazzled, I'd take mine and his tops off for skin to skin contact and it seemed to get us more "in sync". Lots of topless cuddles!
Also, it's hard to feed when the baby is crying. So it's a good idea to let them suck on a clean finger (middle finger - pad to the roof of their mouth) before you try to put them on. They will calm down enough to not get frustrated if they can't latch on. Always try to feed a calm baby - look for their early hunger cues (licking lips, jerky movements, etc).
The best advice I can give is "chest to chest and chin to breast". Hold baby on your chest, make sure he/she is facing in toward you. Tease his/her nose with your nipple to get them to open up wide enough (especially in the early days they may be a bit too tired/lazy to open wide enough - DS was anyways). The midwives told me that you shouldn't be able to see any aerola under his bottom lip, and just a little bit around his top lip.
This is what has helped me and my son - it may be different for you. He is 14 weeks old now and I will continue to feed him for as long as he wants.
I hope this helps. When I was still pregnant I watched a lot of YouTube videos on breastfeeding 'cause I really wanted to be able to do it. I think it really helped; especially since I don't recall watching anyone breastfeed...I didn't really know what to do. There are some good videos on Baby Led Attachment and the "Breast Crawl" is fascinating too - it helped my confidence with Bf. There are some good tips on YouTube on getting a good latch (one is a one handed technique)
I really hope you can breastfeed, it is an amazing experience, and so great for your (and your babys) health and relationship.