That looks like a piece of piss. If you think you can do it, you probably can. You're only unbolting three or four things and basically bolting them back on.
Check the ring gap by fitting them in the cylinder.
Be careful fitting the rings to the piston - they kink easily.
Check whether the piston has a front or back, and that you put it the right way around.
When you fit the piston pin, take care to oil it up first and slide it in gently and not rack it.
Find some detailed instructions for tightening the cylinder head bolts.
Use a torque wrench for everything. Yes, everything, or you will strip something.
Be careful with timing the camshaft. Before removing the cam, put the engine exactly on TDC on its firing stroke and don't bump it. Take a photo of the camshaft, and mark the cam and the chain with a white paint marker. Don't let the chain fall slack and drop into the engine.
Do the whole operation in one hit - don't spread it out over a week or you won't remember where things went.
Make notes and take pics.
Don't thrash it for the first 20 mins of riding it, while it beds its' rings in.
Have fun! Working on bikes IS fun! POST PICS HERE AFTER YOU ARE DONE so we can drool over your hot GN. 
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
"What Steve said pretty much summed it up."
"I did axactly as you said and it worked...!!"
"Wow, Great advise there DB."
WTB: Hyosung bikes or going or not.
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