Natural Birth questions?

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I'm 26 weeks and I really want to have a natural birth. My family isn't very supportive, but the father is and he'll be the only one in the room while I'm laboring. I've been doing a significant amount of research on the topic, but I would like some opinions from people who've been there. 
Is a doula necessary? Aside from pain management and helping to enforce birth plans, is there anything else they do during labor?
Do the doctors really push drugs and interventions on you? I've heard quite a few stories where the doctors kept trying to convince the mom to accept epidurals and wouldn't take no for an answer. Is that really what it's like?
What were the best pain management techniques that you discovered? 
If there is any other advice you'd like to give that would be amazing! I don't have many people to talk about this wth. Thanks!!