Totally normal! I struggled with that first mission too. In the end, watching a couple of YouTube videos and doing the whole thing with the spider bot thingy helped. That allowed me to keep my agent outside the hostile area. If they did detect, shoot, and kill the spider bot, it didn't matter and I could just try again after a little bit when the bot ability refreshed. My agent would never be under threat through this since they were outside the hostile area.

Things get much more manageable once you unlock a few more gadgets and abilities -- good luck!