Front and back rotors are different. For front rotors, after you remove the wheel you need to remove the bolts holding the caliper to the mounting spindle. The bolt can be a standard 6 face head, a recessed hex, or even a torx or star head recessed bolt.
With bolts removed, the caliper can be worked away from the anti-rattle clips the caliper slides on. These clips are called "hardware" and should be replaced.
The caliper pistons need to be pressed back into position because the new pads are thicker than what you removed. The calipers should be tied and suspended and not allowed to hang by their brake lines while you work with the rotors. Use a "c" clamp and an old brake pad to press the pistons back in. Sometimes it is good to remove the cap on the Master cylinder to allow for brake fluid to travel back to the Master.
Either replace or turn the old rotors and then put the brake hardware in place. Lube the caliper slides. then as a unit position the pads into the caliper and hang the caliper over the rotor. The caliper will hang and pivot into place. Replace and tighten the mounting bolts.
The rear brakes are more of a problem due to a second set of Emergency brakes in rear assemblies. So you have 2 sets of rear brakes, the Emergencies requiring clearance to remove the rear rotors. Some car models require readjustment of the Emergency cables before reassembly.
In all, I would suggest that you be an observer for your first brake job. At least get a Video of the process at a number of autoparts stores. You can wind up with a car you can not drive or reassemble without help.
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