I'd love to be able to replace the storage in this Mid 2014 Macbook Pro, I'm pretty sure it's on its way out (about every 2 weeks the filesystem and finder comp

I'd love to be able to replace the storage in this Mid 2014 Macbook Pro, I'm pretty sure it's on its way out (about every 2 weeks the filesystem and finder completely hang). I can buy an SSD for a couple of hundred £, and I have replaced the disks in a fair number of older macs (mostly spinning rust -> SSD) for family members. The cost of getting it replaced by Apple would be a lot higher, and if it turns out that wasn't the issue then I don't have a spare SSD to use as external storage either.