If you have a workshop manual, it shouldn't be a problem. Read it carefully and all the way through the procedure before doing any of it... and I do mean everything. Both Haynes and the official workshop service manual have a habit of only mentioning useful details in the small print!!
You will need to take the top off the brake reservoir first, as it's a sealed, pressurised system. You won't get anywhere without doing that first.
Just remember to put a big rag around the reservoir first, in case any brake fluid spills.
Next, you will want to undo those two bolts marked in the manual. You can then just hinge open the caliper assembly without having to remove the whole thing.
The pads should pop out OK, maybe with a little persuasion. If you do need to fiddle around a bit, opening the reservoir will allow you to do so.
Once those are out, push the pistons back and whack in the new pads. Reassemble in reverse order.
Once the new pads are fitted, test the brake pressure and only then use the bleed nipple/valve to drive air out as you build the brakes back up again.
Alles klar?
Any other issues or questions, feel free to ask.