I agree with the comments already stated, in that if you want to go development, do it. I'm in a similar boat right now as I've spent the last 7 years as a support specialist for a software company handling technical issues and focusing more on customer satisfaction. I graduated with a Comp Sci degree and have always had a love for development. I made the decision recently for a change in direction, and have started looking for development positions.
The one thing I will suggest is to not quit your current job until you have landed the dev job you want. It's one thing to want to do something different, but I would say it's smarter to start trying to make that change that while you still have income necessary to facilitate the job search.
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