Out of my comfort zone

I often talk about getting out of your comfort zone and this leads to improvements in performance.  However when this refers to DIY I'm not so sure.  Being a rest day I tackled building two furniture units, a TV unit and a coffee table.  My problem with DIY, apart from being handless, is the way the instructions are written.  After 4 hrs and 15 minutes (yes I timed it!) both were finished.  The TV unit has a bent piece of wood or else there would have been an inch of a screw visible no matter what I tried.  The instructions were also incorrect in reference to certain screws which didn't exist. I broke part of the coffee table just unpacking it and had to drill an extra hole which should not have been required as a piece of wood wouldn't line up.
I'm now recovering, exhausted!  Am I satisfied that I have completed the furniture builds without hiring someone to do it for me?.....not really due to the problems which are visible to anyone who cares to look.  My performance has improved as these were complicated builds so I will take something from that but in future I'll leave it to people who get pleasure from it!  I'll stick to my Ironman training.