Can anyone tell me how involved it is to change out a motherboard and CPU? I don't have much knowledge of pc building so I don't want to buy something that I won't be able to make work on my own. I have an MSI k7n420 pro board now with an AMD 1.15 ghz processor. Also, can anyone recommend a main board and processor combo to purchase and from where? I would like to be around 2.5 to 3.0 ghz processor speed.