When I solo'd I did my pre-take off checks about 3 times just to be sure.
You will be surprised how it all of a sudden "comes together" when you don't have the safety net of the instructor next to you.
The aircraft will perform a lot better without an instructor and before you know it, it will be all over (the solo and not your life

)
For me the solo was probably the best part of the PPL training and I still enjoy looking back at it.
Enjoy,
FIS
PS. The solo QXC was also a great experience as I managed to get back without killing myself or others