If you wanna customize your blogger template but mess up with HTML and CSS, then I'm there to provide my services for you.
I would make your desired changes in the blogger template. Just send me the XML file of your template and I will customize the template as per your wish.
Contact me before you place any order and describe me in detail what kind of modifications you want. With the starting price of $5, the project duration and price depends on design of the template.