Well there are many ways to bless somthing or someone. It normal differs depending on which diety/s you follow, however you can bless somthing with out useing a divine power. To do so simply state "I bless ____" It can be as simple as that and it can also be extremely complex
That spell wont work on your phyiscal body. The amount of energy need for it to work physicaly would be so great its as good as impossable.
However onto the question: I would get the blessing of a deity or spirit that has domain or works with time.