Customize and enhance existing HTML Bootstrap templates (Using Bootstrap only) -- Updated Project

I have just completed developing the UI HTML component of my website using Bootstrap. Now i would require to make few minor changes and few major enhancements and to also make it mobile compatible to the existing [login to view URL] the changes should be done using Bootstrap only (Bootstrap knowledge, Mobile Compatibility and creativity are mandatory requirement). I have close to 20+ pages in my Website. I want some one who can do these changes with the lowest possible cost. Cost factor is a deal breaker for me... please show some of you Bootstrap experiences while posting the response.