Out of curiosity, who do you usually use for your assembly service? I've ordered boards from JLCPCB, but only ever done assembly myself. Can you typically send

Out of curiosity, who do you usually use for your assembly service? I've ordered boards from JLCPCB, but only ever done assembly myself. Can you typically send your JLCPCB orders straight to the assembly house? Would love to hear more about the process of using an assembly service.