As a computer users, I think you can never be an expert (Bill Gates was famouse or infamouse for crashing Windows 98 or XP when demonstrating some of the functons) but you can be and advanced user. I am an advance user, been using computer for ..... can quite remeber but it almost since PC hit the market.
I don't consider myself an expert in any form or fashion.
The only thing I am expert on is myself.
Computers are interesting, but my usage is somewhat limited and with many things I need to seek help from the real experts.