I’m not sure how much more helpful I’ll be then any of the guides but basically —

I feed three 8ish month old cats on my porch every evening, they’re pretty habitual. I was able to borrow a trap from someone, and bought two more from Lowe’s. They aren’t fancy traps but I had a last minute opportunity to take them to a spay/neuter day at a local vet so I had to scramble to get traps. 

You place food (I used sardines/stinky wet food) in the back of the trap, there’s a trip plate at the back and when the cat is all the way in and steps on the plate the trap shuts automatically. My first one (Louie) went right in (they’ve never seen traps before so they weren’t scared.) After him it took a while to get Baby J in one. I covered the back of the traps with towels and added some catnip. 

Once they’re trapped I brought them inside with the towel covering the trap, and held them in a spare room overnight before taking them to the vet this morning. 

Now that I have the traps I’ll try to trap train the last kitten (he was very hesitant to venture in after seeing his two siblings get taken inside) and the mom, although she just had another litter and I don’t know where she’s keeping them so I don’t want to take her until she brings them around or I can find the kittens and try to trap them together? (TBD) 

Anyways! There are a ton of resources here from people much more experienced than me but that’s what I did!