May just get away with new friction plates as long as you don't have much scouring or blue-ing on the metal ones. I'm not certain you need springs, your call but I'd personally avoid the EBC Heavy Duty ones as some have reported them being too strong, others say they are fine.
It's a really really simple job and you don't need to drain the oil providing you haven't overfilled it or modified the dog bones which can cause the bike to not lean as far on the side stand.
Soak new plates in oil
Put the bike on the side stand.
Remove the clutch cover
Remove the 6 screws holding the pressure plate on.
Remove the pressure plate and all the clutch plates - note their order including the one with the larger internal diameter and the anti-judder spring
Put the new plates in, in the correct order.
Put pressure plate on (make sure it sits flush or you could damage the clutch basket when tightening the screws)
Screw back on the pressure plate screws. They only need 10Nm of torque so really not much at all - too much and you will break something
New clutch cover gasket. In my opinion, you can re-use the old one if it is in good enough condition, but at 48k it will probably need replacing.
Replace clutch cover. Done.
If you have all the parts should take about 20 mins?
Edit: Oh and don't forget to readjust the clutch cable at both ends