While installing a new trigger isn't that difficult, it does take some filing and stoning. Everything on a 1911 must be hand fit for perfection. Unlike the AR-15 which is plug and play. I remember the first trigger I installed on a 1911. I filed too much and then the grip safety wouldn't work, ha, oops... Had to order a new trigger and toss the bad one and try again. I went much slower the second time, took all day to fit it properly. Basically I would place the file on the table and then drag the top of the trigger one way against it, then the bottom the same one way against it, and then I would see if it fit my frame, repeat until it fits. Then lightly stone it so it moves smoothly within the frame. Then oil and reassemble the gun and function check. But yeah the new trigger will be oversized and won't fit and must be hand fitted to the frame. If you're not much of a gunsmith, then I probably wouldn't mess with it. Or have a good 1911 smith do it for you. Also keep in mind Les Baer's are built super tight. You need to shoot 1,000 rounds before you can take them apart. So shoot a case of ammo first and then decide if you still want to swap the trigger out.