Getting speaker wire through the doors is the hardest part. If you have small hands then you may be ok. I'm 6'4", I'll just say my hands are NOT delicate. If I had a gun handy I may have blown my brains out part way through the 1st side. The second side was a breeze once I did it. Do yourself a favor and take care of the passenger side first because it's a little easier and then you'll know how to do the drivers side which has a little less room to work.
I should be finished wiring everything up tonight. I've been waiting a long time for my Scosche dash kit and it finally came.