Writerwannabe83 if you held an info session for pregnant women & partners about breastfeeding then by definition only ones who had an interest would come along, so I don't think anyone could see that as undue pressure.
My experience: I tried to breastfeed but found it too painful to continue. I am sure some would say I should have tried harder. I would have benefitted from honesty about how painful and difficult it can be, and knowing that problems can be of some duration, however, I think that by explaining that you'd likely put some women off, while encouraging others to persevere, so it probably wouldn't help with numbers overall.
I did look at the research on bf before I had my baby. However, I think it is counterproductive to overstate the benefits of bf in an attempt to get more women to do it, because in a western country those benefits are somewhat marginal; once women realise that, they may discount much of what the more dogmatic advocates of bf have to say.
I think the 'it's free!' argument will commend itself to some people (personally, I didn't realise how many bits and bobs you need to ff until I started doing it) and 'it's convenient' to others, although it's not actually that convenient, given that it's still not totally acceptable to feed in public in the UK.
"It's natural" doesn't really work for me as an argument. Lots of really very unpleasant things (labour pain, for example) are "natural".
But most of all I would like women to be treated as competent adults who can make up their own minds, given the evidence available and their own circumstances and for there to be less value put on suffering pain. Discussion of bf seems to take a distinctly masochistic turn at times!