Freewill, I echo all that has been said here. Study, study, study.

I used to change my oil, tires, etc. But as my physical pain has increased, I have to take it to a shop.

I drive into the oil change shop and I say this< "I'm here to have my oil changed, replace the filter and a lube". "Do not approach me for anything more". "I know what this truck needs and it doesn't need new parts or to have some obscure bold replaced".....It works everytime.

Always research tires and have it all written down when you go to the tire shop.

ALWAYS ask around and get recommendations for mechanics. Don't "cold call" on a shop. (Ask trusted male friends>)The mechanics are sometimes paid for what they can sell us and they see us coming before we turn the corner!!

Above all, don't let them see you blink.