Pull the grips off (get new ones).
Pull the controls off (no need to disconnect cabls & hoses)
Remove the 4 bolts holding them to the triple clamps.
Install in reverse order keeping in mind the top clamps may have to face a specific direction (check before you remove them for marks or castings). Then find out the specific sequence and torque values for your bike to make sure you don't over tighten them (a common mistake). Don't over tighten the lever mounts (they should allow the levers to move in a hard impact (teflon tape under them is a good option). DO NOT lube the throttle tube on the bar! Clean and dry only!!! Make sure the throttle tube is either slightly past the end of the bars and some people drop a nickle in the end of the grips to keep from holing them in a crash and to make sure the throttle doesn't stick.
Just don't over think or over tighten anything.