Sometimes it was just opening the box.......

Plenty of stuff ups but not enough time nor line space to mention them all.

Probably the Dumbest was on my Swampy Tele where there was not enough grain definition and tried adding some black ink pad ink which was a big mistake as it ended up a very tacky, sticky mess that took forever to wet sand off as it just kept clogging paper when sanded dry. NEVER EVER USE CHEAP BLACK INK PAD INK AGAIN was all I kept saying for days and days.

Same build fell off the work bench top face down onto concrete floor just after final polish! Perfect if I wanted a reliced look but sadly it took another 6 weeks to bring it back up to same glassy finish. That was probably more clumsy than dumb but still felt the same.