I’m still not very useful at work and I completely recognize this.  My normal tactic is to just kind of ignore my ignorance and plug along anyway.  Today I was asked to do some time sensitive work and began plugging away.  After a few hours I was told that I was taking too long but that something else important had to be done and someone would take over for what I was doing.  The task I was asked to do was trivial and once again I felt like head bee guy.