I'm 40 years old and have been working on cars since my frist car a 1970 Cutlass when I was 16. With that said I'm still learning as well so keep your chin up.
I know this might be hard to swallow but you may consider holding off on the motor swap until later. In my mind that is the stumbling block for a September completion. If you get the suspension, brakes, transmission, rear end and interior complete then you will have a good foundation in place for the motor swap. I know this isn't what you want to hear but it is just a thought. It is also the thought behind not tearing too much apart at the time. If you limit yourself to completeing specific tasks at a time then hopefully you will have a driveable car come September, even if that means that the turbo motor isn't in yet. Again, just food for thought.