Factory pads on a new car has metal tabs called brake pad wear sensors that start scraping against the rotor when that pads get low.....sounds like nails on a chalkboard.
That might be what you are hearing.
slight pressure on the pedal will often times make the sound go away.
anyways do-it-yourself is the way to go as far as i’m concerned.
I’ve saved friends and family mucho bucks by just doing it myself for them.
Usually takes less than an hour...or on my camry 30 mins..
DIY is fine but be sure to bleed those brake lines properly or Murphy will get you tomorrow.
Also if you just change the linings and don’t take the rotors somewhere and get them turned, Murphy will get you a little further down the road, with compounded interest.
But go ahead and DIY if you’re handy that way and you have a good garage at home. Personal choice.