Furniture refinishing is one of my fav hobbies. If you think you many have a valuable piece, get an appraisal first. It it is valuable, hire a professional.
Here are some resources to get you started on diy refinishing:
http://www.furnitureknowledge.com/how_to_refinish.htm
http://www.homeandgardenideas.com/decorating/furniture/chairs/tips-refinishing-furniture
http://padstyle.com/top-25-interior-design-furniture-blogs/810
http://tlc.howstuffworks.com/home/how-to-refinish-furniture.htm
http://www.refinishwizard.com/
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