I ran into some difficulties;
I made pads at the side of the board to program them as ISP.
When I designed it, I didn't mention the pitch, so the ended up useless...
Or I should solder 6 wires every time to each board.
So I googled and found this: Build Your Own SOIC Progamming Clip | Hackaday
So, now I've programmed them all before I solder them. Saves me a lot of time.
Later this week I will post the pictures of the results. 