headings and formating

Hi
How can i change the heading size and page layout to my shop.

im comfortable in html css and php.

You can change the CSS of hikashop via the interface in the Display tab of the config.
The layouts can be modified via the menu Display->Views.

im confused?

could u take a snapshot of where u are refering to...

Here is the documentation of the configuration page with screenshots of the interface where you can edit the CSS:
www.hikashop.com/en/support/documentatio...-config.html#display

Here is the same for the view edition:
www.hikashop.com/en/support/documentatio...op-view-listing.html