It takes more than a price book to properly use flat rate pricing.
There is more to switching to a new way of pricing than simply handing out a price book and wishing your technicians good luck. Flat rate pricing is one component in a new way of doing business with your customers - a way that increases their satisfaction and your profits. However, if this new way of pricing and serving customers is not implemented effectively, you can't take advantage of all of its benefits over the old time and materials (T&M) pricing.
Although long lead times are not necessary, some planning is helpful when switching to flat rate pricing. The books must be ready, and checked for accuracy. Your telephone procedures will change, so your call takers will need to update their script. When customers ask about pricing, they are told that they will receive a firm price for the job before any work is begun.