Convert field types in GDB with Python

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I want to create a python script (ArcGIS 10.1) where I loop through a GDB with several feature classes and select all the fields which are of text type and convert them to float type. I always want to skip the first 10 and last 2 fields of each featureclass as they actually are supposed to be of text type. I am not quite sure how to do so.. I guess FeatureClassToFeatureClass_conversion does the trick but I am a bit lost.