It took me a few "practice" ones, too, before I could knit my first "real" sock. I also tried a baby sock first, and a few stabs at a heal turn, before I really "got it." Don't worry. This is all really normal.
Find a set of DP's you love, pick a yarn that excites you, sit down, and go for it. If it turns out to be just another practice sock, don't worry. Consider it all practice, for as long as it takes to truly get it - then you won't ever be able to stop!