I have ONE Timney, I just bought it for a Howa rifle. Considering how bad a Howa trigger can be, yes, the Timney was worth the money. It is a huge improvement.
Whether it will make a difference to your rifle (what make is it? I'm assuming, due to your handle, it's a Remington?) Our local Remington warranty guy claims that the older Remington trigger is better than a Timney, both are 3 lever designs, but he says the Remington triggers are better made. If that's the case, the new triggers might be a step down from the earlier triggers (which got Remington into about 100 Million $ worth of lawsuits, BTW). I've tried a Timney in my buddy's Remington, it was an improvement in HIS rifle.
He had another guy put it in for him, so I don't know if it's easy or not, my Howa's trigger was a single machine screw and some minor adjustments. Jim knows woodworking, but is terrified of metalwork, so he farmed it out. It couldn't be too hard if Charlie can do it

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