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@Gordon
Hi Tim,
I do have a Bluetooth adaptor shim here that you can download and get printed somewhere like OSHPark - you can then just solder a HC-05 bluetooth module onto it.
It's pretty compact, but it needs an un-pinned board and makes it a pain to wire to the rest of the pins.
But if you don't want to go that far, get one that's got pins on like this and wire it up.
For a simple system you only need 4 wires (GND, 3.3v, TX and RX) and no setup. TX and RX need to be connected to pins marked USART. If you use B6 and B7, when it's not connected to a PC the Pico will automatically make its command-line interface available over bluetooth - you can then connect and and program it via Bluetooth.
Make sure you get HC-05 as that can be both a master and a slave (which you need to get communication between both of them) - the HC-06 can only be a slave.
To get two-way comms, there's some info at the bottom of the Bluetooth page about setting the bluetooth name and Passkey, and you basically follow that but then use commands from the HC-05 datasheet.
Once you've put one into Master mode and told it to connect to the other one you should be sorted... But I'd definitely suggest just getting a slave working first, connecting to your PC :)