Fix Joomla Template and layout

I have a joomla based problem. I was changing the layout of my homepage within the template with a pre-designed layouts, as I wanted to change my homepage to a blog page. So I went into templates and layouts and changed it through the clicking on the blog layout option and ticking it. (I had already changed it in the menu options to show as a blog instead of an article page). What happened next was, all of my sites layouting disappeared and all the colour options that had been customised. A friend helped me set this up a year ago and I am able to run the day to day. However I'm now completely at a loss. The template theme is still installed, and is reverted back to default. I do have some images of parts of what the site looked like before. I also have an akeeba back up installed, but I've no idea how to install the backup file from November. Please help. I would also be looking for a developer to help me with future site developments when this is fixed.