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Applying Paperboard / Isolation
The RFM12B transceiver has some places which are not isolated. As soon as you use a PCB which is soldered by yourself and has no isolation as well, there has to be an isolation between the SHC device's PCB and the RFM12 module.
You can use a piece of paper or plastic for isolation, or glue the RFM12B module with a little bit of hot glue to the PCB. This will also result in a little isolation space.
Please note that the paperboard isolation may not be optimal if the device is used in moist conditions. I have no long term experience using the paperboard as isolation.
Soldering
The gold plated connections from the RFM12 are coated with a little tin-solder first.
After gluing the transceiver to the PCB, you can solder the connections to the SHC PCB easily.