How difficult is it to replace bicycle shifters/cables?

Ty77

New member
I really need a new right shifter on my schwinn (shimano) mountain bike, but I found a good bundle deal for both left and right shifters of the exact model shifters that I already have, which are actually a quite nice of a setup. I keep looking up videos and tutorials but they're usually on road bikes or the shifters are completely different, what I'm really asking is should I attempt this myself? Is it difficult at all? I mean, I just don't want to break anything and I could take it to a bike shop eventually if it is.
 
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