My Parlor had been hanging in a guitar store for months and the wood was fairly dry. This week, it's been raining steadily and I'm just leaving it out on a stand to "humidify". After that, I'll put it back in it's case with the soundhole humidifier. I was told that it might take a couple of weeks to get the wood back in shape.

Not ever having owned a fine acoustic instrument before, is this a good plan?

You need to know what the humidity levels are at. If you don't have a hygrometer, get one. If you are rehumidifying the guitar I think you need to have the levels above 45%. I've read the guitar will not take up or release moisture between 40-45%. I would try keeping it in between 46 and 55% for a few days, then try to keep it between 40 and 50%

good advice from Jeremy.  The Larrivee web site also has an excellent section on proper humidity control.

http://www.larrivee.com/flash/features/education/humidity/humidity.html

Are you living in a desert area?  Most places the humidity has risen to the point where humidification really isn't necessary.

If the RH is OK where you are, as mentioned, just let it rehumidify naturally.  Don't go overboard by using an in case humidifier if the RH is OK.  Over humidifying isn't good either, especially, like any change, when it happens quickly.

I live in Seattle....and I can't believe it...it is 27% humidity.  My hygrometers outside show it and I confirmed it with the weather service.

I have been running a humidifier all winter .(it does not run as much as a month ago.)  At least the temp is going up and my guitar room is holding moisture a bit better.  Now all I have to do is get my Bionaire Gsalileo auto sensor to keep working.  I have gone through two..it just stops working and won't reset.  Good thing I have the sharper image extended warranty!

Go with the rest of us...get a hygrometer and adjust as needed. 

Congrats on getting a guitar worth taking care of!