Just wanted to add one thought. The kit pictured above is probably excessive.
Working on Hondas, the only two brake tools I've ever used can be purchased from O'Reilly Auto Parts.
For screw-type rear caliper pistons:
Lisle 28600
For press-in type front and rear caliper pistons:
Lisle 24300 (mine is actually a little different from that one; it doesn't have a hook on the end, but it works the same)
To facilitate pressing or screwing any piston inside the caliper, I recommend cleaning the boot first so that no debris gets trapped inside the boot when it collapses. If you have the time, there's no reason not to do it. Also, once you clean it, spray silicon spray on it. It will go back in a lot easier than trying to compress it dry.