There are detailed instructions in the trigger hone info in the FAQs, just takes a few tools and patience as well as the parts, might as well change out the hammer spring while you're in their since you have to remove it to get to the t-bar, it's notoriously weak and probably needs to be replaced with a Wolff extra power spring, all this is covering in the FAQs, Numrich has the lifter-striker(t-bar), Brownells hasn't for a long time.
Tim