There really is nothing worse for a customer than going into a business where the staff can't seem to find anything. The simplest request is thwarted because the staff can't find a pen or the latest sales catalogue, or the credit card machine, or some other object that is essential for making a business work.
Being organized is an impressive trait that gives the customer confidence in your business. If you can't even find the simplest of items to complete the transaction, what other things could you have messed up?
Fool proof systems are great for overcoming these kinds of problems. A simple thing like attaching a pen to the counter with string to eliminate the pen shuffle is a good idea. Neat stacking of stock in the storeroom enables you to tell at a glance what you have available for sale. There are literally hundreds of ideas that you can use to improve your level of organization and, as a result, the overall level of customer satisfaction with your business.
A constant bugbear for me is having to chase up suppliers to send me an invoice. We often have to on-charge services and we like to include a copy of the invoice to show our clients that we haven't marked it up. We can't invoice our clients until we get the bill from our suppliers, so if they are slack it affects our cash flow.
If you feel that your organizational skills aren't as good as they should be, find someone who is organized and get them to help you get back on track. Often a fresh pair of eyes will pinpoint weakness in an existing system that can be easily overcome.