That’s why it’s kinda important to get the shape right before you start adding detail
Seriously though, when that happens to me, I usually detach the detail to a separate object, remodel the area where the detail WILL BE and prepare the surface. Then I deform the detail (depending on the type of detail this might or might not be a good idea, also depending on how big changes you need to do) with bend, FFD or whatever, and re-attach it. Make a hole where the detail will be, place it there and then fill up the holes. This won’t work all the time, but it works on smaller things. For example the 3 box-like things on the top of the hip.
Detaching things to simplify is another good idea. For example, I detached the center brown part so I wouldn’t have to worry about the grooves from top to bottom on the thighs. You can usually hide it pretty easily if you do it at the right places.
Btw, if you want to change the size of the hole. If you set up the flow of the mesh in a good way around the hole, it won’t be THAT bad. But it requires some trickery with edgeloops and all that stuff…