Project management is an integral part of any business that wants to develop rapidly and retain control over costs and resources.
Project management is often pigeonholed for larger businesses and ignored by the smaller ones for the red tape it causes. Please don't accept this as the case. In many circumstances its more important for the small business as they have limited funds and resources and need their projects to be right first time.
Its good practice to invest some money in project management training preferable under a recognised standard like PRINCE2. Careful where you spend the budget though as there are several companies out there that charge handsomely for this.
If you are buying IT services, its unlikely that your provider would spend the time and money to implement PRINCE2 fully as part of their quality manual but don't be afraid to ask them what methodology they intend to use or how they will control the costs, resources and communication.
This could save you money and will help to ensure the supplier meets your expectations.