As I currently understand you get the most mats with settlement missions, i.e. looting the lockers. And I'm not good at fighting scavengers and guards in settlements.
Well, I've got some good news for you if you're willing to read on. I too cannot stand the massacre-10-individuals idea; no doubt I am rubbish at it, but mainly to do with my character and RP - it's not his style.
Watch
@Ydiss video -
https://forums.frontier.co.uk/threads/the-definitive-stealth-guide.579192/#post-9233871 - the one thing that massively helped me was the rings on the radar and detection distance. Then read on.
The other day I did a power-up settlement without killing any guards. Here's a simple step-by-step guide about what I did. Note, however, that others here will be able to offer much better advice and methods, but if you're not into combat, this might help you a little further. It's a bit quicker than other stealth methods I've tried too - but can still get you filled with lead if you're not careful. Basically it involves using distraction tactics - the swarming tactic is good for AI to get you killed - here, you use that to draw them away from their positions and use their agressive herd-behaviour stupidity against them:
- Head to the settlement via SRV from the opposite side of the power station, but don't go into the settlement; park the SRV running distance away from the edge of the buildings;
- Before leaving the SRV, switch shields/SYS to 4 pips and engines to 2; forget about weapons - it's up to you which way to face, but I normally face toward the settlement and drive backwards on the escape (make sure you choose appropriate terrain! If there's lots of rocks around, best face away from the settlement);
- Before disembarking, use the superb SRV scanner to see where nearest/dearest scavs are - and use that for the following steps;
- Now head in by foot, taking it slowly - find a guard to target them. Crouch on your way in. Your intent isn't to kill, more to distract;
- Make sure you are between('ish') the guard and your SRV - i.e., do not target a guard to the left or right, unless you've got buildings/terrain for them to cope with. If they're to the left or right with little terrain, re-orient yourself so that there's a line (doesn't need to be completely straight) between the SRV, you and a guard, in that order;
- Stay calm! I cannot stand grenades, so always pre-prep my item wheel to throw shield boosters if I have an "imperial entanglement" (which like Ben and Luke I want to avoid);
- Next - get ready to shoot - again, this is for distraction, NOT to kill - important: switch shields on first - take aim with any weapon, then score a hit on the guard - don't waste ammo - just get them to turn red with anger and for them to sound the alarm;
- High-tail it out of there toward the SRV, and try and lead them away from the settltement (you won't, but that's OK - you want to get them clustered to one side);
- If the terrain is open and I decided to face the settlement with the SRV, I manage pips to fire weapons - when it hits them, they tend to take cover - again not to kill but to really rile them up and get more heading over - don't take too many hits and keep your distance and make sure you keep reversing!
- With the SRV you can now get to a safe distance and use the SRV scanner to see how many there are and where they are;
- Take a wide-drive around the settlement to the PWR side of it, again use the SRV and the scanner to see where the guards are;
- Use the same tactic given in 1 & 2 to park up at the rear of the PWR building if all is good;
- Nip in, re-power, charge your suit and de/re-pressurise & loot;
- Now rinse and repeat for the rest of the buildings that need it - however, if you get them to cluster on the other side efficiently, you might only need to do it once.
However, I've only had to do the distraction technique once at times - I tend to use the building rooftops to find the panel to put fires out, then re-pressurise, check no guards are around, drop inside and loot. Your mileage may vary!
First time around it took several attempts to get it right - but once I'd done it, it was a bag of fun. I like the idea of non-lethal mission completion, again I know these are AI but it works for my character RP of avoiding lethal responses unless absolutely necessary.
In wreckage and irregular marker missions I jump into ship when the scavengers turn up, kill them with dumbfire missiles and get out again.
If you can find rocks and boulders to hide behind, use those; again, tactical use of the SRV some distance from your ship is required. I HATE FPS, but have definitely found my feet. Another thing I've not found mentioned elsewhere is to right-click when holding a weapon and use the target sights - at longer ranges you'll get much higher hit rates and therefore casualties. The right-click method of shooting COMPLETELY changed my combat kill ratios!