assume you have rear discs ? because of the way the handbrake and rear brake pistons work, you will probably need 'brake caliper piston rewind tool' (which turns and pushes the pistons back into cylinder).
If you are replacing discs I would get would get an impact driver as well to get the 2x countersunk cross-head retaining screws out of old discs (these are the very devil to get out, and if you try to get them out using just a screwdriver you will round out the head and have to drill them out). If the discs are hard to get off after the retaining screws are out, there are a couple of threaded holes in the disc where you can screw a couple of M8 bolts to 'push' the disc away from the hub and once the initial 'stuck togetherness' is broken they should come off easily.
other than that just be aware that as you push the pistons back to fit the new pads the brake fluid will be forced back into master cylinder and reservoir, so keep an eye on it to make sure it doesn't overflow, as it will take the paint off if it gets on bodywork, and will damage most things as it is very agressive.
there are also two kinds of pad material, adhesive (which puts a coating on the disc) and abrasive (which cleans up the disc surface as it wears) - original Honda ones are abrasive type, so get discs and pads to match.