Tips for solving your water pressure issues
If you have water pressure issues at just a few possible faucets and shower heads, you can solve the problem fairly easily. For faucets, start by carefully removing the aerator; be sure to do this away from the sink so parts don't fall into the drain.
For shower heads, start by removing the shower head and pulling out the flow restrictor.
Use a pin or needle to push sediments out of the holes in the aerator and shower head. Soak the parts in warm white vinegar to remove scale buildup. Let the parts soak overnight, and lightly scrub them the next day with an old toothbrush.
If you're thinking of adding pressure gauges or replacing clogged pipes, be sure you test your plumbing skills first. Also make sure you're allowed to perform DIY repairs on your water pipes.
Some localities prohibit this and require work to be performed by a licensed plumber.