This is a small problem home owners should be able to fix. Cleaning a faucet aerator and shower head should do the trick. Minerals in water can buildup and clog the shower head and aerators. Remove your shower head and aerator and inspect it for buildup. Clean each small hole with a small pin if it does not work then is a much more complicated task where you will need a plumber to diagnose the cause of low water pressure. The reasons can range from mineral buildup, leaks, or pipe corrosion.