Being in the Denver area, it was no easy task. I was threatened (well, not really) by another instructor that told me it took him 6 months to do his solo cross country flights. Then (low and behold) by some miracle, I was able to complete the 2 required solo cross country flights within one week, then the checkride soon after that.

My suggestion would be to try to do it at the crack of dawn before the weather has a chance to act up (if your examiner has the time). Fortunately (or unfortunately, whichever way you look at it), the examiner suggested to do it at 7:00am. I couldn't sleep the night before knowing I had to get up at 5:00 in the morning, but I managed to get it done.

I'm not quite sure how the weather acts down there in south TX, but that is what I have to offer.

Knock 'em dead !