Hi Teecee,
I may have "cheated" a little bit. I don't know. But when I first started installing into P3d, I used the tool that tells your system where FSX is. I pointed it at P3D instead. So now, if a program wants to install to FSX, it goes to P3D. If it want to install to P3D, it goes to P3D also. You know, it's the FSX registry tool.
It has been a long time since I installed my Beaver. I don't really remember the process myself. I don't remember having a hard time with it either, though. It is one of my best planes in P3D now, and is my favorite, by far.