DJ's pro tips for survival.
1. See the other guy before he sees you. This is tough because it requires knowing what to look for which takes time. Even more important is knowing where to look for enemies. Once you know the high probability locations of where an enemy might be you can position yourself to limit exposure to those angles while having a good view so you can scan for enemies.
2. Don't peek excessively. While peeking/prefiring around a corner works extremely well. If you miss, you should never repeek a corner if the enemy knows you are there. In low time to kill games like insurgency, if the enemy knows where you are they have the advantage and will get an easy kill if you try to peek a corner again. If you absolutely must push past a corner try to utilize teamates via Comms to flank the enemy or in a worst case scenario use frags and smoke.
-DJ