You plan. You measure. You re-measure. You plan some more.
You write it all down.
You go to the hardware store and buy EVERYTHING you could possibly need, plus extra.
You come home, you go to work.
And inevitably something happens that you completely didn't expect and you have to go back to the hardware store. Not only that, when you go, you get something wrong, so you end up going back AGAIN.
Every time! Every single time?
Why is this?