Normal cheap header stuff. You have to fish the socket under that horizontal tube and either use some wobble extensions in the attempt to space outwards to get a ratchet or try to get your ratchet under that tube along with the socket and maybe a real small extension. Most spark plug sockets have a hex on the end so you can use that to somewhat get a wrench on the socket.
Then you’re going to need to get two 90 degree plug wire boots and wrap those plug wires around and under that horizontal tube. If you run them down between the tube and valve cover you’ll burn plug wires every time even with a heat sleeve.
**** sucks to work around. you get what you pay for in the header department. I’m almost out of dealing with cheap ones myself.