This video will show you what you need to get started on using the FT-857D. I'll explain what battery to use, how to put the faceplate, what you will need if you do mobile or out in the field.
Doing research is always prudent. Sometimes we get very lucky to find a tool that is less expensive and does what we need. Unfortunately, there are times when we pay less and the tool is not as flexible as we thought. So doing your research is going to be very important, and making mistakes along the way is part of the process.