Time all of your moves with the radar so you can avoid guards and cameras. Monitor enemy's movements and plan your moves around them also coordinate with the map. The objective of Metal Gear is stealth . Try not to get seen anywhere on this mission. Cling to walls, crawl past guards and evade camera surveillance as best as possible.
Hesitation is a gift.
Time your moves. Master the use of radar so you can move without being seen. You are the big blip onscreen and the smaller blips are the guards and cameras. Shoot guards only when necessary and use the pistol with a silencer . Use two bullets to kill each guard.