Can you hold a screwdriver?
If so, you don't need "to go the Apple Store for tech support".
They
won't help with this kind of upgrade, anyway.
Really, the upgrade is simple enough that anyone can do it.
You need two tools:
- Phillips #00 driver
- Torx T-6 driver
... and the SSD.
It would also help to buy one of these:
https://www.amazon.com/Sabrent-2-5-...478&sr=1-2-spell&keywords=sabremt+usb3+to+ssd
It takes only about 15 minutes to actually "swap" the drives, and much of that time is removing the screws from the back cover, and then replacing them later on.
You can go to ifixit.com to see what's involved.
Again, it's easy.
The part that "requires attention" is preparing and testing the new SSD before you actually swap it out.
That's what the "adapter/dongle" is about (see above).
You can also use the dongle to keep using the old HDD once you take it out.
Again, did I mention that this is easy enough that even you can do it...?