Can I transplant a 13' cactus in September?

I need to transplant a 13 foot tall San Pedro cactus which is in full bloom in San Francisco. It is growing in the ground in a space surrounded by concrete, so access to the roots is difficult. If I don't move it, it will be destroyed by the construction of a house on the lot where it has been growing for fifty or more years. Is there any chance a cactus that size can survive the trauma? I can't rent any heavy equipment because access to the lot is too steep, so it will have to be moved with pick and shovel just a few feet to my remaining garden space. Is it worth trying? Any tips on how to transplant it without breaking it?