It's an older HP G62-225dx. I'm leaning towards just replacing the HDD because I can do that on my own no problem. I was able to find a spare 500GB HDD at my workplace so no cost required. If this was my own laptop I would consider a SSD but I'm sure my brother won't know the difference and just be satisfied to have a operational laptop lol.
On other hand, replacing the fan is going to be an absolute nightmare. I've watched videos on how to get to it and yes, I'll need to completely dismantle it. All the way down to removing the mobo. Can't wait!