It's actually not that hard, provided you have the know-how.
Your best bet to find out how, would be to attend a System Builders Conference/Summit
I have had the immense privilege of attending a couple of these as a gatecrasher once, as the token geek second time --- and IMHO your first investment should be to pay up and attend one with badge, rights, and everything
I can assure you that everyone there will be very straightforward, business-like, helpful, and will do everything they can for you
Get yourself a nice suit, some ties, immaculate shirts, casual wear just in case, plentiful cash, 100% secure cell phone and laptop capabilities, BUSINESS CARDS, PROTOTYPES, and et cetera ... and make sure that you already know the lingo before wading in ; us token geeks can get away with a heck of a lot more than any prospective OEM ever could...