A quick note on inserts you can design to put them on the back side of a part, instead of on the front. It makes for a lot stronger. To pull the threads you would have to pull right through the part. There are lots of ideas. I think I have a very similar kit to the one you ordered.Well that was painless. Used my 40W Weller with included tool. When I read ~185C I started feeding into 3DP. Went in slowly & predictably, maybe 3 secs? When it was ~ 0.5mm proud I flipped it over & pressed it on a flat surface to make it flush. Seems sufficiently strong for what I'm targeting it for right now. Maybe someone has done a gorilla test.