Good progress, this heat some of us are in makes any work outside rough.
For the brakes, try hard to never remove the slide pins or bolts, the type with a rubber boot which seals the grease inside. Those should not be separated, which exposes the grease and pins to contamination, unless you know the grease is very old.
Simply remove the two main caliper mounting bolts, not the little ones which hold the sliding pin bolts in. Remove the whole assembly, clean everything, push the calipers in, and then install the new pads, the rotor, and last the caliper.
Those sliding pins inside of rubber boots with grease, are the main caliper wear item. They don't wear much at all over many years, but if the boots are removed and any dirt etc, gets inside, then the will wear much faster, even with new grease. The grease in those is capable of lasting 10-15 years, the pins along with it. Try very hard to never remove those slider pin bolts.
Do them at a certain age, say every ten years, or when you suspect they have been opened up by accident and the grease may be compromised. At that time the whole area around and in those slider parts needs to be cleaned really carefully, well, and filled with the proper caliper grease. Most people when doing brakes are in a fairly big hurry, and that's a bad time to be rushing with the critical grease parts, that must not get any debris inside with the grease.
The brake job is also faster and easier when you leave the slider pin bolts in place.