Ask around your area to find an electrician that is familiar with re-wiring houses. This is not a job for a beginning electrician or one that has little or no experiance in doing this type of work.
There are two choices on how to do this job. Cut into your ceiling or remove some of the floor upstairs. How your house is built and the location of the existing switch will determine how this job is accomplished.
There's a bracket you can get at your home supply that will work. It has spiked ends and a screw-out center section. One end is clockwise while the other is counter-clockwise. You screw it out between 2 ceiling joists till the spikes embed in the joists. There's a u bolt that bolts the electrical box to the adapter. That's all it takes to hang it, now you have to get the electrical to it.
I had a similar situation, and that's the hardware I used. I also had to open up a endwall for something else so I ran the electrical at that time.
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