My iWeb site features pretty highly on relevant google searches without meta-tags so i don't think you need to worry about it 😉.
Many SEO experts feel that meta keywords may actually hurt your rankings on some of the most important search engines.
Meta descriptions, on the other hand, are still a good idea, for the SEs that use them as your description.
I just added them in manually, though I am wondering if it can be done with iWeb Enhancer? Do the meta tags need to be in a particular location in the HTML?
Thank you for your response.
If it is not a good idea to use keywords etc. how do I improve my site's web positioning?

My iWeb site features pretty highly on relevant google searches without meta-tags so i don't think you need to worry about it 😉.