An inexpensive way to pressure test at home is to rent a coolant system pressure tester from an Auto Zone or Checker/Kragen, if you have one near you. They have a FREE "loaner tool" program.
Just hook up the tester in lieu of the pressure cap on your coolant tank, pump it up, and wait for the leak to appear.
Have the front of the car up on ramps or stands so you can get a good look at the source from above and below. This is important because sometimes a leak on the underside of the engine can be coming from a hose or component above.
Apologies if this advice is too basic. Good place to start, though.