Yoast local SEO plugin is compatible only with their Wordpress SEO plugin, you will need to install that first. Having said that, local seo would add the proper schema.org markup to your page which you can easily test on the google structured data testing tool to make sure that google can read it. Its a one time payment and would save you time and money if you dont know how to manually add the schema. It also provides you with a shortcode for route planning which could be an additional extra for your website visitors.