Honestly, don't. I was thinking about the same thing, but the days where it's profitable for average joe's to mine are long gone.
Even temp. profitability means nothing, because it lures you to buy equipement, and then diff changes and you're left stranded.

This is just my personal experience, other may not agree, but i for one think it's better to straight off invest in buying bitcoin , then in bitcoin/altcoin mining, unless you're cheating power companies.