What you have are great questions that you alone will be able to answer.
The first question you will have to answer is, are you able to do this job yourself? It sounds like an enormous task.
I have tackled two stairways and 800 square-feet of flooring. So far I have finished one stairwell and am working on the other. This would be more than most folks could handle, but I have the advantage of having access to good tools, plenty of time, and a dad who is an expert furniture designer and builder acting as my consultant. I also broke the project into small pieces that I can complete in phases.
You will not find any better resources than the pages accompanying this forum:
http://www.hardwoodinstaller.com/hardwoodinstaller/. Read the pages, imagine that you are doing the job yourself, and then see if it is one that you really want to tackle.
It's not impossible, but quite difficult to find a professional installer who will be willing to come in and finish off what you no longer want to do, or can't do!