Disk swap question

Hi, have got a DS920+ with 4 x 8TB disks in SHR1. Bought 2 x 16TB disks. I will need to power it off as I can't reach the disk trays when it is on, but is it literally a case of: pull disk 1, put in the 16TB, wait for the array to repair/rebuild/whatever, then do the same for disk 2?