The cage is a 3-point, no? Should be very easy to install. Hardest part will be cutting fairings (use a dremel and clean up the cuts with fine grain sandpaper). Rear sprocket is just a few allen bolts AFAIK, front might need some sort of tool you can buy for a couple bucks or make yourself. Buy a chain with a clip link and the right size and no tools are needed. Double-check the R3 motor doesn't get oil-starved at wheelie angles, remove tipover sensor, drop your rear psi and go nuts.
But it is just a 300. Gonna have issues eating clutches with rolling burnouts (easy to shim springs), 1st gear is useless unless you can roll a slooooow (like 15-25kph) balance point wheelie, and not the greatest aftermarket stunt part support. You'll want a sub cage/12 bar, probably new handlebars, handbrake bracket, better rear brake pads, etc.. 300 stunt bikes are kinda in-between the more often used groms/pitbikes and 600's.
But anything can stunt. More about skill than bike choice
edit: when you change your gearing, download a GPS speedometer and test your actual speed vs your speedo @ 100KPH. Mine is 16% off now!