It is really easy to do this by hand and if you are doing lots of sites it would be well worth building a working text document with the text to paste into the RW Head. You often need to add the stuff that SEO helper doesn't do such as business opening hours, business type, etc. There are plenty of good sites that will show you what exactly to create and also test and validate.
If you have Foundation you can also use SEO Helper with Foundry or any theme.
Or simply copy the meta data from another similar site and edit the specific parts of your business and load to your site. It can be a good exercise to look at the data used in sites that are highly ranked by Google which you can copy, edit and paste.
I do think that there is a place for a really good general SEO Meta stack that helps to create, offer guidance and has links to validation all in one package.