Here's a pretty good Youtube video that might be of benefit.
Don't forget to squeeze in the caliper pistons before removing the old brake pads. However, before you do that, pop up the seat and look at the rear master cylinder reservoir (that is for the front brakes) to make sure that it's not totally full. Because when you compress the pistons, it will push the fluid back up into the reservoir and you don't want to have brake fluid overflow all over the place. When pushing in the old pads, push them in all of the way flush with the caliper, but DON'T go too far. If your hands are strong enough, you should be able to do it with your hands, but like the Youtube video shows, you can do it with a wedge.
I can't remember, but there are 1 or 2 pins that hold the brake pads in place. Brembo uses a small circlip type thing that pushes into the pins to lock them in place. You first remove that small spring circlip and then unthread the pin(s). I don't remember which, but it is either torx or allen, but make sure you use the correct head to unthread the pins, otherwise you'll make a mess of those pins. They aren't that strong and are not hardened steel.
There is also a steel spring that keeps pressure on the pads and holds them in proper alignment. Just make a mental note about their orientation, because sometimes they can be put in backwards or upside down.
When reassembling, make sure those pins are very clean and smooth. I recommend using some small amount of brake grease on those pins to make sure the pads move freely on them, and on the threads on the pins as well. Also, a tiny amount of that grease can be placed onto the caliper where the pads slide in the grooves. Just make sure that none of the grease gets onto the pads or the disc.
Reassembly is in reverse order with blue loctite recommended for the caliper mounting bolts. Then gently push the brake peddle several times to seat the pads. Once the pads are seated, check the master cylinder reservoir.
HTH