What are some of the biggest mistakes you think the average angler might make in his or her outfitting and outings that might cost them an exceptional fish or good #'s of fish...?
...any thing from tackle/gear preparation & choice...to landing a big fish incorrectly...line choice, drag set, lure retrieve, whatever comes to mind.
For example, I don't sharpen my hooks. Maybe at some future point when I've got more time on my hands...

Just thought it would be interesting to see what people here have in the way of opinions on big "no-no's" when fishing. Maybe I can correct a few bad habits I never knew I had.
W.