I tried to be a tailor...
I tried to be a tailor, but I just wasn't suited for it. Mainly because it was a so-so job.

An accountant is having a hard time sleeping...
An accountant is having a hard time sleeping and goes to see his doctor."Doctor, I just can't get to sleep at night." "Have you tried counting sheep?""That's the problem - I make a mistake and then spend three hours trying to find it."