Nah, overhead squats are the hardest ones, so why not get that one down pat before moving onto the easier ones? I know people who can squat some relatively heavy weights that get owned by a bar and light weight for overhead squats (this includes kids who FS between 120 and 220kg for reps). Overhead squats teach you body tension and make you flexible so it is a must to get them right. Get the OHS and the FS and BS will follow rather easily
Brian's suggestion is what I always have prescribed for people to find their squat stance. Just get into the bottom however you want, fidget around, and make sure you can get an upright torso with knees and hips tracking over your feet before calling it your stance.