Easier way to use external imported characters to replace the standard TPS character

I’ve been watching alot of videos on importing characters, such as those made with mixamo/fuse, and trying to get them to replace the main TPS character. The problem is every time an update occurs, the videos become outdated. I’ve watched too many so far and am so close to giving up. If there is a way to implement some sort of system such that characters that are generally the same structure, ie man and woman and hero and boss and even alien, that have a basic hierarchy of a human body so be able to use them automatically with options to modify that would be wonderful. I’m spending so much time on this I can’t do much else, and it seems that the community is slow to add concise tutorials on this process. Please implement an easier system than having to rig , retarget,blend, then fail. Thanks.