[Devin D.Bass]

I still am so confused...
Please explain this to me like a six-yearold..
If I install the P&N 2.3 does it overwrite my TDM? If no, then will the TDM races be available to play? Will they play properly?
What is the P&N 1.7????
Do I need a create a new directory for the P&N 2.3 mod, and and how will I play it. Currently the path is directed towards the TDM stuff. Where does the AI Patcher come into play? Finally, Matryx has a mod switcher how does that factor in?

Sorry about the multiple questions but it si soooo confusing. I really want to play this mod but I don;t want to disturb my current game under the TDM Mod. Please help? Remember to make it simple as possible.