This is a fairly easy job if you have the right tools. So lets start there:
19mm socket for lug nuts
15mm socket for Caliper Bracket
7mm allen for Caliper guide bolts
10mm socket for removing rotor holding pin
C-Clamp or equivalent for compressing caliper
Flat blade screwdriver for removing anti-rattle spring
Two new 15mm Caliper Bracket bolts, (they're one time use)
new pads while you're there.
Step 1: Loosen Lug nuts
If using a hand tool. Use the 19mm socket and the right sized ratchet to break the bolts loose. Hey, you could even use the lug wrench the car came with. We're not fancy here.
I have an impact wrench.
So if you're doing this by hand, break them loose, not too loose then we'll jack up the car.
Ok, all the safety things here: The car's in park, the parking break is on, you have not only a jack but a jack stand once it's in the air. Cars are heavy, they can swash things if you're not careful. Be careful.
The jack point for the Volvo is where the subframe attaches to the body. You'll find it. It's a good sturdy place to use.
Jack up the car to get the wheel off the ground. Then go a little higher and get the jack stand under the car near the jack. Lower the jack till the car is resting on the stand. Then I go and jack up a little again till the jack is tight against the car again. It's a belt and suspenders kind of thing. I don't want it to fall.
I use my impact wrench now to spin off all five lugs from the wheel. Then I slide the wheel under the car. Just one more way to keep me safe.