The problem with laptops is that there is a lot of things that you have to worry about that are not nearly as important. In your case going from a processor that has a 25w TDP (Thermal Design Power, or the amount of cooling that it needs) to a 35w TDP processor. Checking a couple things out I would think that you can check out the processor without a major complications and that it should be a simple matter of replacing the old processor but when it comes to laptops there is always some questions. So be careful or better yet get a professional to do it for you.
Christian Wood
Intel Enthusiast Team