Okay, it's done. I'm moving next month, permanently, to Spain

.
I'm a EU citizen so residency is not an issue; working... I don't know.
I'm giving 'most everything here in New York to the
Salvation Army but have a dozen boxes or so to go with me.
Does anyone have experience with reliable small volume shippers on the NY -> MAD route? Or any other helpful advice &/or warnings about the move.
Thanks...Grant