Repeat after me (only pathetically to the good lady)
" I was drunk and I was wrong, I can't build a deck"
Of course.... with the appropriate expression and all. It will only hurt a minute and THEN someone else can still build the deck.
I would think it would be worth it. LOL ... even a day or two of death ray stares..... worth it !
I might go down the route of trying it and then admitting defeat gracefully. I just find myself thinking, how hard can it be? Whilst deep down something rumbles inside me like Jabba the Hutt saying Hur hur, you fool!!
Or start it a little crooked and claim you think it will be fine that way. THEN she will insist that you stop right away and get someone else to do it.
I am quite sure she will see my straight for crooked and call a halt to the proceedings no matter how good I think it looks. I am surprised she has let it get this far. I might be in for a lot of sawing today!