lm3898 - You should go for the full marathon! But you do need to commit to a decent training program, and some long Sundays (or Saturdays) spent running/walking for many hours. There are many times you will want to quit it and give up. If you follow 85% of your program (most people have a bad week or two) you will be able to finish. Finishing should be the ONLY goal for a first marathon.
The actual marathon itself is 80% mental, IF you've done adequate training. Seriously. The biggest problem people have is running the first part too fast. At 18 miles they run out of gas and bonk or hit "the wall" and drop out. Or slowly walk-hobble to the finish.
My first motivational book was "The Nonrunner's Marathon Guide for Women" by Dawn Dais. NOT for the training schedule mind you, but for the funny sarcasm. Parts of the book are hysterical (IMHO). The best training plans (for me) have been Hal Higdon's and Jeff Galloway's. Higdon's has more weekly mileage (better for losing weight) and Galloway's has a lot less mileage during the week, but longer runs on the weekend. He also advocates run/walk which is probably better for the injury-prone. I'm sure there are others. Like I said, the biggest obstacle is the time commitment.
I'm sure other people have other suggestions.
