[computer-tech-support: 7860] motherboard replacement

I have an older HP Pavilion computer where I need to replace the motherboard as some of the pins on the motherboard have broken off for connection of the hard drive to the motherboard. I when to HP website and got my specifications for the manufacturer and model number. I need to know if this is all I need to know when replacing the motherboard. Can I just match up the model number or the model name to get a replacement? Also, is it as simple as plugging everything into it as usual because that is what I think. I've never done this before, but it occurs to me that all I am going to have to do is screw in the new motherboard and attach all the fans, cables, etc. to it and then all is well.