I just finished replacing both my iPhone's battery and home button. In terms of the battery and home button, everything was a success - my iPhone is charging now and home button works very well.
Unfortunately, I must have somehow damaged my screen's digitizer during the process, most likely when trying to get the screen off with the suction cup. Obviously I must have applied too much force that led to my screen being damaged.
So now I have an appointment made for tomorrow morning to have a professional iPhone repair team replace my screen + digitizer. It's unfortunate to have spent the time and money on the self-repair when I'm left with a phone that can't be used now and requires professional repair anyways, but again, this was my own fault. The kit from iFixit was complete and steps were very clear.