navigation issue

I bought a navigation unit on ebay part number 10377531. I have the y91 option on my truck (03 H2) and i bought the antenna for this unit. I think all i need to do is remove my current stereo and install this one (plug it in) with the antenna and it should work perfectly, steering wheel controls, amp etc will work as before. Do any of you know if that is true? Also I was told any stereo shop or dealer can reset this unit with a tech 2 scanner in a minute or so. Is that true? Please help. Thanks so much.