That’s fine. I trust myself more than Apple.I've heard too many stories every week just browsing reddit or the Mac forums here. It's really hard for Apple to make sure a third party doesn't do a bad job or mishandle your device. But if you use Apple to repair a device then there is a much stronger chance they will do a top job.
90% of customers won't be able to handle batteries and they should not. This is a very toxic part and one break in the material releases a very toxic deadly gas when the battery reacts with air.