Hi, it's time to do 30k miles maintenance service, and I am going to do it myself. I believe that 30k mile service is, oil change, automatic transmission fluid flush, engine mount checking, and reprograming transmission computer.
I can do all of the above excpet reprograming the computer. Is this really necessary? Do I have to take it to a shop to do it?

I also need to change tires. I believe they are 195/55/15 size, and I am thinking to change them with 205/50/15. Will I get more harsh ride and road noise with wider tires??

Thank you.