Well I am certainly no expert but am very happily exclusively breastfeeding DD1 at 18 weeks. All I can say to you is that it is amazing, really beautiful (sorry if a bit pukey but it really is so special!) doesn't cost anything (well except for breast pads in the early days!), is completely portable, good for you, and of course incredibly good for your baby.
It took us a couple of days in hospital to get her feeding well, we were both knackered after a looooong labour, but it was well worth sticking with it. My advice would be to stay calm, they won't let your baby starve so even if it takes a bit of time to get started don't panic, just enjoy the time bonding with your little boy.
I had some amazing help from the midwives in hospital, they literally grabbed baby, grabbed boob and married the two together - what surprised me was how firmly you need to bring the baby to your breast. I don't think they have that approach in every hospital but if you feel self conscious about being touched I can see it could be uncomfortable - but if you can relax with it, it really works!
If I were you I would post ALL your questions on here now before your baby is born - the more you have got your head round it in advance, the better I reckon it will go. Once he's been born you may well be incapable of posting on here for a few days so best make use of the collective wisdom of MN while you can!
The other thing I think is important is feeling able to feed in public. If you don't, you are confined to the house which is not good for you. You will probably be given a leaflet at antenatal/by the midwives showing a list of all venues which are Breastfeeding Friendly - if not you should be able to download it from your local NHS website. The main one is at the bottom of this page. It is also worth practising beforehand how to get baba latched on without exposing your nork - at home i am frequently to be found wandering around with one boob hanging out - it's only a matter of time before I answer the door like it! Anyway when out that is probably best avoided, so I tend to wear a vest under a t shirt, pull the tshirt up and the vest down (so your belly is still covered up), move baby into the crook of your arm so his head is in front of your boob, then unclip your bra.
Also worth trying to get bras with good 'coverage' over the top of your boob like these - so if you are just wearing a vest type top you can pull it down and unclip your bra but the top of your boob will still be covered up.
Sorry I have waffled on for ages, just wanted to think of anything general that might help you!
When is your DS due?