My first solo was much the same as above. I had just done a couple of circuits with full stops with my instructor. As we taxied around for another take off he asked me to stop and said...
"right... we're are gonna try something different now"
with that he took off his seatbelt, and climbed out.
No words can explain that feeling. I too talked to myself all the way round.
"F*** S*** F***" etc...
I was my instructors first student too... it must have been worse for him!!!
Not sure you will ever feel ready for it... just got to concentrate and do everything as you have been taught to the letter.