simple: don't screw up
seriously though, by following some standard guidelines for adding acid, good recipe formulation, and knowing the types of wine you like already (i.e. I like most reds, esp merlot and chianti...I dislike most whites, especially chardonay)...you'll minimize the chances of making a stinker.
Also, just because you don't like it, doesn't mean its bad wine. Give it out as gifts. Most 'kit wines' will only run $2-$4 per bottle, and you get about 30 bottles per 6 gallon kit.
you could effectively cover all your christmas gifts to relatives for less than $70, while having fun! (i enjoy making and watching fermentation as much as I enjoy drinking the finished product).