I gotta ask is doing this edits superhard? If not maybe some pointers on how newbie like me can do it?
I would say it depends on what you're trying to edit. But I have nearly ZERO skills other than patience and a fairly steady hand, and I've made several that I'm quite happy with just using MS Paint.
Pointers depends heavily on what software you're using to edit. For myself?
--I hate working with color, so I try to mix and match characters with similar skin tones...easy for the many caucasian characters, trickier with others.
--Some of the simplest edits are changing eyes and mouths...easy to cut and paste, but can make dramatic changes in a scene.
--Another minor edit that can be fun/interesting is depth of penetration...SR doesn't do enough deepthroating, IMO. But you can also use it with several pics, to make it look less static (he himself did this in some scenes).
--Since Paint only allows 90 degree rotation, I watch for positioning so I can tell what elements of one pic are going to line up with another.
--That said? Remember that you CAN rotate and flip assets around...characters can go from standing to lying, reversing direction to match a different pic, heads can move (I made a pretty decent shot of Wonder Woman getting her head yanked back by the hair)...
--Try selecting and cutting/moving characters around, to see what looks good...if you love that scene of Lex fucking Stargirl doggy style? What other heroine's face could you make work there? Is there a shot of another heroine in a bent over pose, where you could move Lex's sprite in to be fucking her? Try it rough first to see if position works, then do another run paying close attention to detail.
--Little details make the shot. IMO, this kind of thing takes a lot of patience, to go back over a pic fixing tiny little elements.
Don't be afraid to try! To quote JT Dogzone, "sucking at something is the first step to getting kinda good at something".