Hi,
If I make PCBs the one thing I keep in mind is SERVICEABILITY , someday, probably the first time I try it, I will have to change something, or a component will fail.
The number of PCBs I find that are UNSERVICEABLE because of the quest to make it SMALL, is increasing in the commercial world.
So make your PCBs so you can work on them when it comes to component replacement and trouble shooting.
You may want to put a CRO or DMM probe somewhere, make room for it, be generous with TEST POINTS on your PCB.
GND Test point
Vcc or Batt+ Test point
Any voltage regulator output Test Point
Any signal output Test Point
All a Test Point needs to be is a solder pad.
An indicator LED to show when the PCB is powered up, if you want low power put a cuttable/removable jumper link in series with the LED.
Don't try and make it look completely like the commercial guys.
I repair PCB's, usually without circuit diagrams, the inclusion of labeled test points can cut the repair time in half.
Tom..... 
PS So endeth the lessom "my basic philosophy on PCB design".