Beware that the S2/S2+ has the driver soldered to the pill (there’s a pic in this review thread) and it can be an absolute pain in the butt to get it removed! (The pill acts as a heatsink pulling away the heat from your soldering iron.) The mcu is on the underside of the driver so you have to remove it from pill to flash. I would suggest you try something like a Convoy M1 that uses a retaining ring to hold the driver rather than solder. For practice and testing purposes you can also simply mount an LED to an old computer heatsink and wire a Nanjg driver to it leaving it dangling (I do this to test my flashing results). Yes, you will want a selection of good tweezers and possibly “”snap-ring pliers”:Amazon.com .
I would recommend trying out “STAR” firmware as it’s pretty basic and easy to adjust modes and such.
-Garry