LIke I said, I don't buy the complete kits, but I would imagine there is no soldering involved for the bolster or guard.
All of the blades I make, have soft soldered guards/bolsters along with the pins I install with them.
If it is just pinning, it should be pretty straight forward, and I believe Jantz also sends instructions for assembly.
Good Luck,
If you are like me, it will become addicting.
I cut out the steel and grind all my blades, mainly as a form of stress relief from work. Of course, this has led to an excess of blades around the house. LOL
HL