I think it's quite difficult.
I struggled with the three pins on the right shoulder (A8+D1-18) and it took me a while.
Is it just me? ?
The instructions said to attach C1 to your arm and then align the three pins, but I found that difficult so I attached C1 on its own and then attached it to my arm later.
Plus, there were a lot of parts where I was like, "Do I put a sticker here?" and it was a bit of a pain for someone as clumsy as me.

HG Messer F01 Model Production ② | ぽっぽ's Gunpla works