Disconnect battery, Remove both handlebar switchgear units. Remove front brake lever and reservoir unit and secure it with string or something so the reservoir doesn't turn upside down and let some air into the lines (very unlikely to happen......but better to be safe.... ) Remove bar end weights. Remove clutch lever and perch. Remove clutch side grip. Undo handlebar clamps Loosen throttle unit and slide it off the end of the bar......but you may need to slide the bar across to the left side of the bike to allow it to clear the end of the bar because of the throttle cable. Refitting is the reverse of this......but.......wrap a single layer of insulation tape round the bar where the switch gear units sit. The switch units may have a small pip on the inside surface that locates them into a hole on the bar to stop them rotating, but the Renthal's won't have the locating holes in them......so, either file the small pip off the inside of the switchgear units, or carefully drill a small locating hole in the new bar in the correct place........me? I filed the pip off the switchgear unit..... Make sure that the front brake hose is not tight......and the clutch and throttle cable routing are ok and you can turn the bars lock-to-lock without the revs going up or the clutch cable pulling and causing the clutch free play to disappear.....