Yeah i'm gonna be honest and say i voted expert as i've been messing up peoples pc's for quite some years now....
I work as an engineer and although i don't claim to know everything, I am pretty handy with me screwdrivers and and am tinkering with the bl**dy things 8 hours a day, 5 days a week, 52 weeks a year....So if that don't qualify for expert then i'm going home...
The Dictionary meaning:
expert
adj : having or showing knowledge and skill and aptitude; "adept in handicrafts"; "an adept juggler"; "an expert job"; "a good mechanic"; "a practiced marksman"; "a proficient engineer";
I hope to think that i am a proficient engineer....
As Citech said if i were no bloody good, they would soon get someone else....