Replacement 6-speed shifters

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Hi all,

My wife's 18 speed suspension bike has twist shifters which are horrible.

Can't afford a new bike yet, but can I change the shifters to idexed lever type?
Something like Shimano Tourney/TY - TX50 6-speed Thumb shifter plus, as well as the left hand 3-speed front chainset shifter to match?

Also are they easy to fit?

Your help and advice is much appreciated.

Tony
 
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