I tried to do it myself, but you need a impact wrench to loosen the bolts, or a long pipe bar to put over the torque wrench to help as others on this site said worked for them. Didn't have that either, so I took it to a local auto repair and they did it for me for free. I got lucky, they were cool guys and said they never saw a Toyota Corolla all TRD'ed out, thought the car was hot, said no charge. As for the difference, yes, I noticed a big difference, as I also installed the front strut brace as well. In my opinion it's well worth the cost.