1) put power on and watch for the magic smoke or
The technical term for this is "smoke checking". Although, some new electronics have a different kind of tell sign... they let some interestinc electronicky fragrance in the air. It's quite nice, but don't use it on a date.
Now seriously, excessive heat on resistors or voltage regulators is sometimes a sign that you may have something wrong.
How to see if it's not connected correctly, check the voltages... if you have a short circuit, most likely the voltage is 0 or almost.