Hi,
I'm an experienced developer, and have been working with Javascript (jQuery, React.js), PHP and HTML5 for some years.
What you need is probably something really simple, we could split it into two milestones.
First: I make the primary changes, as you wish
And after that we review what has been made, and start the second milestone:
The final adjustments to best fit your needs.
And we are all set!
Thanks! Let me know if you have any questions.