Don't do it unless you can capture all your brass and reuse it.
Brass is expensive - $39/100
Powder - $26/lb
Primers - $32/1000
Bullets - $27/100 <- non reusable ;-)
So the first rounds will be about $0.70/rnd, after that ~$0.30. That compares to a box of 20 at Academy in Houston for $5. So it costs $1 more per box to reload, but you get other calibers for about a $40 investment after you've bought the reloading equipment for the 7.62x39. If you get the Christmas special on a Hornady or RCBS press kit, you get everything you need. Just make sure not to use the digital scales around CFL fluorescent lights, the glow discharge in the bulbs screws up the scale readings - big time! I actually bought an old school scale to avoid the problem.
What ever you do, be safe! Double check the powder throw, look into each case before you put the bullet in, make sure you don't put too much powder in the case. I am really goosey about having a big bang I don't want.
I can now reload .40, .357, .308, and 7.62x39 - I got 700 rounds of .308 bullets for the purchase of the reloading press from Hornady. I also got 100 for the 7.62x39 dies, the .40 dies, and the .357 dies. Now the bullets aren't exotics, but the .308 is costing me $0.03/rnd right now, as I had .308 brass already.
You can buy a Harbor Freight ultrasonic cleaner, a basket from Lyman, and get sparkling clean brass in about 30 min. The solutions are reuseable so buy a good one, although I've got a homebrew receipe using phosphoric acid, dish detergent and a little baking soda which works very well.
If you decide to reload you'll enjoy the great feeling of seeing handwork come alive.