The last whole week...but only 'cause I'm sick. I know eventually I'll kick this and it will be 50º out and I will be glad that I'd doing it!

For me, the toughest part of the run is the first few feet. Once I get going I can usually settle right in. Sometimes when the runs have been tough, I will try to mix it up and run a hard/fast instead of a mid-range run, or go out for a long and very slow jog just to work it out. Fortunately for me, the variety thing seems to work. It can be especially tough in the winter, since 99% of my runs are on the tm. Don't put too much pressure on yourself about your first marathon. You'll get there.