i hold certification in mil spec wiring and would never just lay the wire onto the lug.if you can you should at least have a mechanical joint aswell. folding the pre-tinned wire(s) over the edge of the lug.this also holds the wire in place so you have two hands to solder.one to hold the iron and one to feed in solder to the joint.
You make a valid point, I always struggle trying to hold the wire, feed solder and solder at the same time. When I have this problem I use the wife to hold the wire...note that's the part that usually gets hot after awhile LOL
