First obvious question,
why you want to upgrade the CPU?
Sounds a decent one to me (not stellar, but way better than most crap I usually work with).
What's your problem with it? Maybe it's just a stupid software issue we can help sort out.
(fun fact: this CPU is actually an APU, that means it is a graphic card as well, like Intel's Atom processors, the graphic card in your APU is enough for movies and stuff, but for gaming is a bit low)
Since it's so new, maybe you can still go back to the seller and swap it for a better one (adding cash as needed). Most physical shops allow you to do that. Internet ones... not that much but you can still try.
As far as heat issues goes, it's not so bad as Deacon said. You need to keep an eye on the TDP of the new CPU (it's a number of watts as TDP is Thermal Design Power = amount of heat that the damn thing generates when at full throttle and the cooling system has to get rid of) and you'll be fine.
The tricky part is disassembling the damn laptop down to the mobo. You need to find service/disassembly manuals if you want to do it well or be REALLY REALLY careful and possibly asking help to some friend with experience (it's also funnier to do with a friend). Maybe someone on youtube did a video tutorial. I only found
this that tells you how to remove correctly the keyboard (usually once that is done you have access to all screws you need to unscrew to open the thing). Again, doing that may void warranty (it surely will if you change the CPU) AND you can seriously damage your laptop so be very very cautious and don't try to open stuff with force. Better stop and stil have a working computer than forcing it and trashing everything.
Buy a
good non-conductive thermal paste, then
clean the old one and apply the new one properly.
Now,
your CPU is using socket FS1, so you need to look for CPUs that fit in that socket AND that are rated in the
35 watts of TDP.
Warning, there is also socket FS1r2 (revision 2 of the FS1), and i read about people that tried to fit a FS1r2 socket CPU in a FS1 socket mobo and was unable to get it working. You may want to do more research to see if it's actually possible to do it as FS1r2 CPUs are better.
The best CPU that I found for your socket seems to be
this, but its TDP is 10 watt higher, so it may have overheating issues (or not, it says it is suited for laptops bigger than 15", and yours is a 17" so it should run well, theoretically).
Its integrated graphics is basically the same.
