not true. The upgrade process is difficult only to those fools that do not study how to do it before hand, much like a desktop. The only problemas you will have are the ones you make yourself. Just take your time and be methodical. A camera helps, take a picture everytime you disconnect something so you have a reference as to what goes where. For the removing screws and such, take a piece of paper and sketch approximately where each hole is, and tape the screws to the hole you drew for it to be sure that you put it back in the right hole. You will need thermal paste and the CPU, as well as any other parts you want to take care of while you are in there (like when I do mine I am installing the bluetooth moduel and a WWAN card, and replacing the subkeyboard RAM stick with a 4GB one).
Look for the service manual to your laptop, as it is your firend. It will have all the little tricky things that you might miss listed. Also, youtube is your best friend, look fr a video of dissambley of your laptop, and its just monkey see, monkey do.
