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Its not hard to do and does improve the trigger pull. The pictures in the link helps a lot. The only other (expensive) option is to order a trigger from JARD.
It is. The hardest part for me was getting the three tabs depressed to get the plastic side plate off. I used two small needle nose pliers to bend the spring.
I had my T-Bolt out today; there was no wind so I set up a target at 100 yards. I didn't measure the groups but I was happy with the results.