First ever solo!!
I think that you have probaly by now seen that the general opinion is go for it!! I remember my first solo as one of the best experiances of my life just remember your training and sure enough you will be sat back on the runway with a grin from ear to ear, One thing i would say is watch the performance of the aeroplane without the extra weight of the instructer it caught me out and i flew a circuit of 1400 feet but made good with a superb landing.
GOOD LUCK and let us know how it goes!!!