The P0700 is a base code for the transmittion. It will be set and stored in the PCM under the engine section. There is another code that breaks down this code into more detail. Its usually under the trans section. If you used a Generic scanner im not sure that you will be able to retrieve it. You can flash out the D4 light and that will give me a better idea of what system is reported failing.
The second part is that Yes the TCM is as easy as unbolting and unplugging. Than reinstalling the new one in the reverse order. Its not a hard repair and a simple DIYer can do it.
Im not really sure that this is your problem though.
Have you checked the trans fluid yet? Level, color and smell?
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