Yeah, there are tons of threads on each of your concerns. Hmm...in short though (not gonna get too detailed here, babe's tugging on my toes, lol):
Cord around the neck: Very common, just uncoil it after babe is out (well...some people can uncoil it once the head is out, but sometimes a short cord makes that difficult)
Meconium aspiration: a lot of times is caused by medical interventions and fetal stress, but even if baby inhales meconium, watch him carefully. if he/she looks and acts fine, it could be fine. If babe was grunting or not breathing, or gasping, or otherwise grabbing at my instinct to get help, then I'd get help.
Placenta wont come out: breastfeeding usually speeds this along. Placenta may take anywhere from 5 minute to even two days (or more?...I forget if there was a lady on here that had it take longer than that...), and thats fine as long as you do not feel ill. There are herbs that can help too.
Hemmorhaging: I'd eat a piece of the placenta ASAP whether I were hemmorhaging or not. Breastfeed. I think there are herbs for this one as well.
Breathing problems: Turn babe on stomach and gently rub back. Turn the hot water on in the shower and let the steam help clear airways. If it is serious and babe isnt breathing, perform infant cpr, if that isnt working call an ambulance.
Breech: a standing squat has been known to be the most helpful position. Do not let anyone tell you what to do! Go with your instincts here, let gravity help as much as possible. RELAXATION is seriously key here. The baby's head can come out perfectly fine. It is usually a frightened mother that literally closes up that causes problems. Dont let anyones negativity get to you. Address your fears, do research. Knowledge is power.