I finally got around to opening my Striker Manus and Rioter this week (which I'm surprised I didn't earlier as they are AMAZING), and I want to apply some toyhax decos I got for free with RD to em. Unfortunately with my partial paralysis I doubt I can, especially with where I wanna but em. With RD I want to put em on the center of his chest here:

If possible.
And one on each shoulder of Manus


Here are the decals I received to which I have no clue how to apply and not even sure I can cuz I know it's gonna have to be the small ones

 

This is a good short tutorial on waterslide decals which should cover what you would have to do to apply. With the smaller ones you might be able to do it one handed with some practice(if that's helpful in your situation). It looks like you have enough extra you could practice applying a few to something else first. Smaller decals in my experience are usually easier than big ones.