I'm reasonably comfortable with PC configurations myself, and the various variables available to compose a theoretical system. In practice though, and I've whitnessed it close up, just combining superior components is no guarantee whatsoever that the configuration will actually work (reliably). I've seen that even an experienced electrical engineer can get stuck, just because a memory stick is of the wrong brand, or a motherboard's timing is not optimal, or the latest firmware is not installed, or ...
To recommend such an enterprise to someone less experienced is plainly naive, irresponsible, stupid.
The extra money paid to someone with the responsability of providing a working solution, is well spent.
1. An "electrical engineer" really has little to do with electronics or computers. I don't see the relevance.
2. You must be kidding.. there are a zillion "how to build a PC for dummies" books out there, Youtube tutorials, etc.. this is one of the easiest self-help projects of our times. I think it would be plainly naive, irresponsible and stupid to suggest it isn't. (tongue in cheek of course..)