There are many different things that may indicate a need to make adjustments for your long legs. Squat in front of a mirror and note how far you need to lean forward to keep your balance. You can also carry out the method to identify your ideal squat depth - if this is not as deep as you would like your squats to be, you can start to make adjustments. You can also trial and error. Mix up your workout routine with some squat variations that are better for those with long legs. If you feel more comfortable and confident with these variations, you may want to incorporate them into your regular workouts.