I just picked up a used mid 2012 MacBook Pro with 4 gb ram, i5 cpu and 500 gb hard drive. It is running High Sierra. I have a used Crucial 120 gb SSD that I am considering putting in. Do I need ant special adapters. Thought I read somewhere that you do. This is my first Mac and so far I like it, so would like to learn more. Will also upgrade to 8 gb ram when I can afford it. Thank you for your input.