First solo job on my car didn't go so well .... Aaarrrrggghhhh!

I was so excited this afternoon to undertake my first solo job on my car. The car has been running hot, so I took the radiator to a local shop for a pressure test and flush. I was hoping this would get me through until the engine swap next year, so that I don't have to buy a radiator now.

My husband had a working dinner so I changed the thermostat and reinstalled radiator all by myself and waited for him to get home to make sure I had done everything right. I was so proud of myself. I'm totally uncoordinated with the tools. I was basically raised by a single mother and I learned how to use a butter knife and high heel shoe as tools ... Not wrenches and ratchets!!!!!

So my husband gets home, checks my work and everything appears ok. I filled up the radiator and the damn thing started leaking!!!!! After checking all of my fittings, etc, we figure there is a hole in the core somewhere.

Could the pressure test or flush have caused the radiator to leak?

I'm sooooooo frustrated!!!!!