One thing so many designers forget is to check work properly before sending it off to be printed. I always tell my staff to put finished projects to the side and work on something else for a bit before the final proofing stage. It is very easy to not see the forest for the trees as the old saying goes.
If time does not permit another good option is to have a co-worker look over the project for you. Even if this person is not a designer they may see some detail that was missed. The best possible way for them to view it is to create a full mock-up on oversize paper. Then you trim it down to size checking bleeds, fold as needed and pass it around. This will assist in making sure bleed, folds and margins are correct.
Another forgotten detail is spell check, A rule of thumb to get in to is to always run spell check before you make a PDF or a mock up, you can NEVER spell check too much! It’s much easier to correct the spelling BEFORE the project is printed!
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