I am really big - quite embrassingly so!!
However, I nursed my wee one from dot in the sling and then at 6 months in a LLL wrap, you'll need at least 6metres of fabric - it covers up all the bits you need to cover and when you become quite adapt at it nobody even knows you're nursing, I loved it and so did my dd
, I stopped carrying her a couple of weeks ago when I found out I was expecting No.2, (dd was two in August). You will need to support whichever boob you are nursing on with a hand so make sure that you have things accessible to the other hand such as purse, bus pass, hankies etc., other than that it is really easy and makes life so much more enjoyable. If you need anymore help or advice please PM me and I'll see what I can do for you.