Retrospective assembly

I’m about to receive my PCBs from you. If I find self-assembly too difficult, is it possible to then order assembly from yourselves - provided of course that I return the PCBs with parts, or would I have to start again from scratch?
Thanks,
Terry

When ordering a Assembly, we create a Panel with fiducials as well as a fitting stencil according to the specifications of our assembler, this is not possible when using a existing PCB.

You have to start over when ordering a assembly, you can however mark the components in your BOM as customer supplied and ship them to us so we can assemble them.