Not only is is really easy to do but it is extremely cheap to do.
Apart from the initial setup costs of the vat, heater etc, the ongoing costs are little more than $15.00 (AUS) per 30 740ml bottles (or as I do 60 375ml stubbies).
I use the Coopers brand of product and have had only a few failures. These are normally caused by things like, not keeping at recommended temp. (21 - 27 dg C), not cleaning bottles properly or not allowing enough time for the WORT (what they call the brew in the vat) to properly ferment. The basic directions are......