SSD upgrade for mid 2012 MBP

I recently started getting performance issues with my MBP while running apps like Xcode and Eclipse. A quick diagnostic of the system showed that it thrashed over 458k times.

Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000b   095   095   062    Pre-fail  Always       -       458757

I just ordered a SSD to replace the HDD, will this help solve the problem, and also how do I get OSX back onto the computer if I replace the HDD and the new SSD is empty?