I am by no means a techie person, so I wanted to report on my success renovating my late 2011 MBP 15 this week.
It's a 2.2GHz Core i7 which came fitted with a Hitachi 500GB HDD and 4GB of ram. For the past year or so it has been running painfully slow. In fact, some weeks I did not even use it for anything but playing music as it was too aggravating to use. That beachball makes me want to violent things. Thus, I concluded I need to upgrade, either to a new system or to work with what I have.
I opted for the latter option as I love this machine. We've been through a lot together, and although the screen has a few pressure marks, I still prefer the old matte high resolution screen on my machine over the retina screens of the new models.
Said and done, I went on Amazon and ordered a 500GB SSD from Crucial's MX200 series, and 8GB of ram from the same manufacturer (an EU marketed 'Mac Kit' product code CT2C4G3S1339MCEU. Grand total: £127.96 for the SSD + £47.99 for the ram + £6.99 for a USB to SATA cable = £182.94. Not an insignificant cost, but obviously a lot cheaper than buying a new computer.
I formatted the SSD and cloned my HDD to the SSD using Disk Utility in OSX without any problems. Crucial's MX200 SSDs apparently come without any proprietary cloning software, but I truly do not see the point of cloning software when Disk Utility does everything you need for you.
I never made a bootable USB. Rather, I ensured that everything worked by booting from the new SSD as an external drive with the USB to SATA cable. When I was convinced that everything worked as it should after booting all my key apps and files from the SSD via USB. I went ahead and replaced both the stock HDD and ram.
I already owned a set of jewellers screwdrivers and the bottom cover screws on the MBP easily unscrewed with the No.00 Philips head. I had to supplement my existing tool collection with the required torx head for the screws that are used to mount the SSD in the storage unit cradle. Moreover, I also took the opportunity to buy an airduster to clean the fans and innards of the MBP. Slotting in the new ram was stupidly easy, and so was replacing the HDD with the SSD.
Upon the first bootup, the screen remained grey for a minute or so and I thought I messed up, but then the system loaded without any problems.
Truly, I cannot recommend enough to owners of MBPs with replaceable HDDs and ram to upgrade their hardware using new memory and storage components before buying a new system. I hope and think that this 2011 machine will now last me another three years. 2011-2018 would be a great run!