Nobody knows everything. The trick is to know how long to wait before asking for help.
I had an engineer that worked on his code for a week with no results before he asked me for help. He had a field named “T0TAL” instead of “TOTAL.” — zero instead of the letter o.
I used that example in a class of users at work. The zero in total was directly below the o in Do. I used a special font in the overheads so that the difference could be seen.
Not one person, out of 120, saw the problem. The most common question, “Does that type of problem happen often!” Yes.