upgrading harddrive in late 2012 mac pro

I am looking at upgrading my hard drive (SSD) in my macbook pro 13 inch late 2012 retina (A1425) to a Seagate 1 TB laptop SShd hybrid 2.5 inch.

from what i have read online this hard drive will fit my model laptop. I am aware that i will be sacrificing speed for space. Is there any adaptors or trays i need to purchase to go from the SSD connector to a SATA? also what is the process for installing the operating system to my new hard drive once i get it? thanks in advanced.