With it idleing that high, the front clutch has started engaging ,which spins the belt,which makes the transmission parts spin ,so yep it'll hard to shift, unless you want to start it in gear, which you can do.
You may have bumped the throttle cable or carb. while servicing it. You should see a lil thumbwheel screw attached to short cable,that is attached to the carb. ,should be on the right side, just turn that counterclockwise and the idle should slow down.If that doesn't slow the idle down, check for slack in the throttle cable, this is checked at the electric throttle control, which is on the left handlebar, pop the top off, and look inside ,you will see 2 metal contacts,and have them spaced at 1/16"-1/8" gap,adjustment is made on the cable farther down the handlebar, almost where the speedo. pod is. set the idle to specs. the tag for idle speed should be on the right side ,by the rope pull..
if that doesn't get it, you may need to remove the right side cover on the carb. (3 screws), where the throttle cable goes into, and give a shot or two of lube, thesealing ring on those are notorious for not sealing very well and it could be full of gunk.
And welcome to the forum