As said, changing a battery is an ok job, but as with any other work on a car, only if you are confident to do the work. If not confident then Honda fixed price work is good value when you take into account the 'take it back, it's not working, simplicity'. This can be much more difficult or confrontational at a chain/backstreet workshop. Ideally, I think a good local reputable garage is best for that sort of work. But they are not so easy to find now.
However, exhaust is different, Honda parts are very expensive, even after a discount. If it were me, on a 2007 car, I would buy pattern parts and get said reputable garage to fit, again as said previously. From my experience with the pink peril, If the exhaust doesn't play ball when splitting the sections, you need to be able to get right underneath and have help. Not always easy at home.