Guys, how hard it is to change the belts yourself?

Also, for belts is there any recommendation for a brand or place to buy from? ZCD?

 

It's about as difficult as changing out the spark plugs.

Loosen the compressor on the bracket, push it towards the motor. Loosen the alternator on the bracket, push it towards the motor. Take the belts off. Take the belts to an auto parts store. They will measure the length and get you replacements. Put the new ones on and use something like a broom handle to pry the alternator and a/c compressor away from from the motor to tighten. I get them tight enough that they will twist about a quarter turn. Check the tightness after you've driven your car some. It's easy.