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#21
You don't really have to take any precautions first - this would be one of the safest operations to do, as long as you don't delete partition 2. It is always a good idea to have a backup image of your system created because you never know when something could happen to it, whether or not you are actually messing with the partitions.
You would run the diskpart commands one by one, pressing enter key after each one. The command to run in a command prompt (admin) after all the diskpart commands would be:
reagentc /setreimage /path \\?\GLOBALROOT\device\harddisk0\partition3\Recovery\WindowsRE
reagentc /enable