I accidentally ordered a set from JLCPCB that did not have the attiny. I think someone claimed the qty between when I checked and when I pulled the trigger. I wasted a ton of time learning how to solder those mini pins. It was so difficult to find the #1 pin indicator. On some of the chips, the dent was invisible. I thought I correctly figured out what orientation the writing was, and I was able to see the writing if I held the chip at the right angle with the right light. I soldered 4 before realizing I should test it. I was wrong. Of the remaining 6, one crapped out. I bought the desolder stuff and was able to get the chips off. I resoldered one, but it didn’t work. The second one worked. The cats were hiding in terror. I vowed never to buy any board that requires surface mount soldering, even though I am now somewhat competent at it.
The time cost is ludicrous.
The experts have no clue how much they know, and how many ways a novice can screw things up.
I will run my 8s pack with just one module before I buy another module where I have to solder the attiny. I check lcsc.com every day to see if they have the attiny in stock.
My kill rate was 4/10.