I haven't done it myself, but my cousin has done his numerous times - it is more involved partly due to the swingarm and battery holder issues, but is certainly do-able. What is the mileage on the bike?
One potentially weak spot is a jackshaft that is buried deep in the transmission assembly - don't usually fail until well over 150K miles, but when it goes, the amount of time and labor and parts to replace it makes it more economical to just by a whole new gearbox, or even engine w/gearbox, from BeemerBoneyard (which my cousin did also do). It supposedly has a characteristic chattering sound if it is failing, but I don't have asound file of it.