There's a lot to signage that's sometimes undersold and overlooked. The beauty of all exterior and interior messaging is that it gives a business a sense of belonging and has a permanence that's hard to achieve any other way.
There's no time for cold feet when planning signage, it's the original "GO BIG", or well, forget it. Mastering the scale and proportion of outdoor branding is a big part of succeeding. Allowing enough time to do mock-ups and really understand the location and the surrounding elements; buildings, other signage, access to the business, etc., can help to avoid mistakes that are painful to correct. Making sure the branding is finalized before applying it to signage helps avoid missteps and frustration down the road.
Large-scale branding that's done professionally plays a major, positive role in introducing your business to the community and can be equal to an invitation. Signs for way-finding, like parking and directional helpers are important and appreciated by patrons, this builds trust in the brand.