Yes, you can always try following the product guide and do a DYI appliance installation. However, it can lead to a series of problems. It's better calling a professional plumber than an unlicensed one because professionals make proper plumbing adjustments for the best solution. They install your appliance so that there are no leakage complaints. Besides, they perform your appliance installation with the best care and only perform necessary plumbing fixes to ensure your investment lasts a long time.