there is no need for you to do anything else. virtually every user, young or old, new or seasoned, expects the header logo to take them home.

every single major site on the internet, including reddit, behaves in exactly this way. by making your left-aligned header logo a clickable link back to the home page, you have met user expectations and do not need to do anything else.

edit:

here is a list of the 500 most trafficked sites on the internet. while i haven't gone through all 500 to see which ones violate the convention of making a left-aligned header logo the sole link back to the home page, 100% of the sites i did view, which were the top 30 sites in the united states that did not require a login to view, all behaved in exactly this way.

this includes google, wikipedia, youtube, yahoo, msn, ebay, bing, tumblr, apple, flickr, etc., etc., etc.

unless your client specifically asks you to add a home link to the navigation, or to use something other than the header logo to link back home, don't do it.

feel free to conduct your own research.

http://www.alexa.com/topsites