Hi I just did this so and couldn't find a guide how this helps and I will try and make this as detailed as possible:
As you can see there is a metal clip that is holding the two pins in place, I found the bottom one was easiest to get off. Also turning the wheel so the assembly is pointing out makes it a lot easier. I was doing it my self, but on the second one I got Oscar to give me a hand and it to seconds to get th first pin out.
Put pressure on the clip (I used the edge of a plier) and once the clip is not touching the pin just hammer it out with what ever fits (I used and alan key and a hammer)
Once pins are out the pads are exposed and can be removed.
You will need to push back the calipers, I gave the pads a little knock with the hammer to give me enough gap to wiggle a very small flathead in the gap and very gentle not to damage the discs. I pushed the pistons back using the small screw driver and then using progressively stronger tools. It's easy to get the old ones out as they are thin.
However to get the new ones in you will need to push the pistons in all the way, you will have to push one in and then hold it on place when you push the other one in. Be careful not to pop the pistons out of their seals almost happen to me when I got to enthusiastic
The pistons need to be ALL the way in to get the new pads in and a little tap from the hammer might not go astray.
Once they are in make sure you have the clip positioned the correctly and replace the pins pointed end facing out.
With a helping hand and the right tools about 40 minutes work, if that
As you can see there is a metal clip that is holding the two pins in place, I found the bottom one was easiest to get off. Also turning the wheel so the assembly is pointing out makes it a lot easier. I was doing it my self, but on the second one I got Oscar to give me a hand and it to seconds to get th first pin out.
Put pressure on the clip (I used the edge of a plier) and once the clip is not touching the pin just hammer it out with what ever fits (I used and alan key and a hammer)

Once pins are out the pads are exposed and can be removed.

You will need to push back the calipers, I gave the pads a little knock with the hammer to give me enough gap to wiggle a very small flathead in the gap and very gentle not to damage the discs. I pushed the pistons back using the small screw driver and then using progressively stronger tools. It's easy to get the old ones out as they are thin.

However to get the new ones in you will need to push the pistons in all the way, you will have to push one in and then hold it on place when you push the other one in. Be careful not to pop the pistons out of their seals almost happen to me when I got to enthusiastic

The pistons need to be ALL the way in to get the new pads in and a little tap from the hammer might not go astray.

Once they are in make sure you have the clip positioned the correctly and replace the pins pointed end facing out.
With a helping hand and the right tools about 40 minutes work, if that