It's good advice to hire a pro if your taxes are not straight forward. My business was simple, so I did my own.

My only advice as far as hiring someone is this. Hire a pro. NOT someone like Block (heads). My mother hired them years ago and was puzzled... she did the return herself and found they "missed" $3k. She went back and they apologized, but refused to refund the fee. I went to see them and got the refund. And subsequently wrote a "letter to the editor".

Oh... one other thing, especially for those over 75 who pay on a quarterly basis (in Canada). The form that CRA sends has an amount to pay. That amount is NOT necessarily correct. A pro will determine how much you should pay quarterly. Last year, my mother paid the amount on the form and the government had the use of over $2.5k of her money... refunded after filing without interest.