If you’re talking about the hold down pins like Oldtimer mentioned (the shiny ones in the upper left in your picture), you put the pins in from the back, then put the cap deals on the spring, compress the spring against the shoe (I use pliers to hold the caps and just push down) while holding the pin in from the back with my other hand. Then twist the pin into position where the flat part catches in the cap. You have to hold your mouth right, but by the time you get to the 4th one, it’s pretty easy .
Or buy the tools like Tester mentioned. I never had a ton of trouble with drum brakes using a couple of flathead screwdrivers, large pliers, and vice grips. Then I discovered a spring pulling tool that came with my kids’ trampoline and that made it a breeze. Now everything I own has disks other than the truck. It has drums in the rear with a single large “spring”. I think they make a tool for it also that I don’t own lol. But, also doable with the aforementioned flatheads, pliers, and vice grips. Although more of a pain.