Well, I just did a MS150 here in Dallas, TX. My boyfriend and I made it 133 miles. We took a short route on Sunday. So we did 78 miles on Sat. and 55 miles on Sun.
We just took it bit by bit.
We did the first 20 miles and then took a break. And then we did 10 miles to the next rest stop... and so on. When you take it in chunks like that, it's much more doable.
The most I had done in 1 day prior to this was 40 miles. Otherwise, I was putting in 50-80 miles a week on my bike. Neither of us really trained for it... since we were training for other things (a triathlon and duathlon).
OH, as far as the wind blowing... go ride in it lady. It will only make you stronger. After riding in 20-30 mph wind for the last 4 months, it only bothers me slightly now, and I can keep a 15-17 mph average in it.
Best of luck... you can do it.. but get some time on your bike before hand!