Well, here’s what you need to start.
- Solder paste for the LEDs: https://www.banggood.com/XG-Z40-10cc-Syringe-Solder-Paste-Flux-Paste-Sn63Pb37-25-45um-p-973158.html
- Solder paste for the springs and electronic pads: 2 Stück 50 g bleifreie Niedrigtemperatur-Schmelzpunkt 138 Grad Lötpaste Sale - Banggood Deutschland sold out-arrival notice-arrival notice
Keep these pastes inside of a ziploc bag in the fridge.
I guess you already have a good soldering iron, along with appropriate tips, correct?
- Any kind of temperature adjustable hotplate
And that’s about it.
There are also some other things you can get, but just PM me for more info. 