First off, you have to wash your hands with soap and water, wear a pair of gloves, and lubricate them with KY Jelly or Lubrivet. A person with small hands would be best to do this. The details are outlined on www.extension.purdue.edu/pork/health/farr.html.
You cannot be so remote that there is no vet for you, or even a neighbor that has experience with birthing livestock. So open up that phone book.
Honestly the Perdue link is a good one. It is sad that your pig is having this problem, but if you weren't prepared for it then you should not have bred her in the first place, or should have had a vet already on standby, weeks ago. This is poor planning and poor caretaking on your part.