I believe you can get pregnancy books with directions on how to deliver your baby at home if you are stuck. (Or how your husband can help you.) Mine are all packed away right now or I'd look it up, so I could pass along the info for you. I believe if the cord is around baby's neck, you are supposed to try to get a finger under it and slip it over his head. (and no, I don't know how you would do that yourself in the middle of labour!)
But, all that being said, it's pretty unlikely that this will happen to you - don't stress hun!
You know you might have a short labour, so you can be prepared! Make sure you always have someone to contact in your last weeks - if DH is out of reach, have a family member on call, or a neighbour. Have the emergency numbers posted by the phone (you might forget even the easy ones under stress). Keep your bags packed and ready to go.
I had a 7 hour labour from start to finish with my first, and I was also a little worried that the next one would come too fast, especially since the hospital was 30 min away, and DH was working 1 hour away at the time. I was sure that by the time I knew I was for sure in labour, and called him (and his cell was not working reliably either! :eek: ) and he got home, got changed (very dirty when he comes home from work) brought Elyse to MIL's (on the way to the hospital) and we got to the hospital, we'd have the baby in the ditch!
But it all worked out beautifully! I went into labour when Dh was at home, everything stayed fairly light and manageable until well after we got to the hospital, and Marieke was born after 7 hours of labour, just like Elyse.
So don't get too worried about it - you might go quickly, but at least this time you will know, and so you can plan and get ready. All the best!