It's not very fun when I don't know where an error is.I'm practically all self taught so welcome to my world! I would never know where an error is or what the error even is.
Android Studio isn't reporting any error right now, but my app keeps crashing.
I'd use a freakton of print statements to breakup the code so I can track down which section the error occurred. If it's a problem where the program just crashes or can't run, I'd comment out all the newish code and slowly add it back until it breaks again. Also involved a lot of just general trial and error.
Wasn't until fairly later that I actually started learning about the "correct" way to fix bugs.