I have a spreadsheet I use to capture "all" my relevant elk info in.
one of those tabs is -"Lessons Learned". it has 582 rows on it after ~13 trips.
if I ever write a book, it'll be titled "elk stuff I messed up".
the list is way too long to share, and I've spent $35k (according to the "costs" tab, same spreadsheet) gathering that compilation of stupidity!