I have 0 experience, just starting out, ordered some 10 gauge wire for loop key
I’d definitely practice a bit if you have 0 experience. it’s not rocket science, not super hard at all - but practice will help a ton. I have a pile of mangled connectors i f’d up when i was swapping connectors on my batteries.
if you have some spare 12awg or 10awg that would be best to practice with - smaller is too easy. bigger wire is harder since it sucks the heat out of your weld quickly - needing more heat, more contact area, and flux is definitely your friend. I’d get some no matter what you are soldering.
If you take two bits of 12/10 wire and squish them flat then try to solder them together - i think this is a fair approximation of soldering in your xt90/xt60 connections. bad connections/solder here will break and be no fun. As in if both break and you have live wires touching… welding and fire possible… In a loop key like your drawing - much less likely to have a hot + and - touch… so much safer at least.
these guys make good videos - skip through some of the intro BS and watch how they do it… should help!
This is a great intro and tons of good info (if a bit long) on soldering:
HTH and GL!
Thanks for the link, the Old guy is great!