Newbie need to learn to replace break pads by myself

obito

I've never change break pads before. Now I think I need new break pads. Do I need to replace 4 of them at the same time? Where can I find break pads for my sport model ? I went to several websites, but when I try to buy there are only 2 choices. First is for Base model and second is for Touring. I heard that Sport model have different brake system, so I do not know what kind of brake pads I need to go get. Moreover, my friends said it is very easy. I just need to remove wheels and remove 2 pins to remove old pads and replace it. I am looking for some DIY ,but I didnt found any. I found one how to change rotors,but I just need to change my pads

PS. I black out my own headlights, so my friend said it is easier than what I did. I should be able to do it with ease.