I busted up the thumb shifters on my mountain bike in a modest little crash. I took a bad line through a rock garden and fell over hitting the shifter on a rock. Got it working good enough to finish the ride but needs to be replaced.

Current shifter is Shimano SLX 670. Bike has 2x10 drivetrain with XTR derailler.

Anyone advise on the level of difficulty of replacing shifters? I've done some minor maintenance jobs like replacing shifter cables, replacing chains, truing wheels, etc and wondering how difficult a job replacing shifters is. Since I need to replace the right one, thinking I might as well upgrade to Shimano XTR shifters on both sides while I am at it.


Thanks.