Procedure to add a new enclosure in HP MSA P2000 G3

Hi Folks, Currently we have a HP MSA P2000 with P2000 G3 controllers and one P2000 6Gb drive enclosures.

I need to add an extra enclosure P2000 6Gb drive with 12 disk drives , I found the User Guide at https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c02254382 but I would like to heard your recommendation based in your experince, about the process in how to add a new enclosure in this kind of storage.

One question that I have is , Can I do it in hot or Do I need to turn off the storage ?

All information provided is much appreciated.

Thanks.