Clothe 6 3D Models of Characters for Use in Unreal Engine

I'm working on an Unreal Engine game set in ancient Arabia in my free time. Still, I'm more or less sh** at 3D modelling, so although I have the 6 models of humans (from MetaHumans in Quixel) and I have the clothing I want on them available, it's annoying for me to combine the 2 in Blender without screwing it up. All you'd need to do is take the character models and the clothing models I have, combine them into 1 3d Model (using Blender or similar) that looks realistic and is ready for use in UE. Of course, that would entail fixing footwear (default in MetaHumans is slippers, which don't fit the time).