What OS are you currently using?
You can use something like this to set up your SSD before opening your Mac:
Do you have a hard time accessing your own old data stored in your old Mac or Windows laptop? Well here’s a solution to that problem. The SATA to USB adapter cable supports 2.5 inches external SSD HDD hard drive. It has a 22-pin adapter. This hard drive adapter will help you to gain access to you...
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I would reformat it, install the new OS, set up the new OS, migrate all you data using the migration assistant, and after everything is set up with it, open your Mac to do the SSD swap.
You have ELEVEN iPhones?!?!!
Yeah, I might have bought another one since I last updated my signature.
I still have almost all of my old iPhones, with the exception of my 6s Plus, which I sold to a friend, and my 4s (also my favorite design), which my daughter lost.
Not to mention all the other hardware?
I have been using Macs and Apple products for a while now, since 1994 or 95.
I still have almost every Mac listed in my signature, with the exception of the iMac G5, the original iPad, and one of the Performa models. My daughter lost the iPad. The iMac G5 had some caps blow on the power supply, I took it apart to replace the caps, but lost interest after dismantling everything, and ended up trashing it. I forget why I got rid of one of the Performas.
Everything else still works with the exception of the Power Mac G5, I think it has some type of logic board issue if I remember correctly. I was trouble shooting it like 10 years ago, and can't remember exactly what happened, but I remember that after doing a fresh install of the OS, after a few times booting, it wouldn't boot anymore. Just a white screen. I think there was a LED light for trouble shooting on the logic board, and the number of flashes said that there was a problem with the logic board.
I might end up just gutting it one day and make a Hackintosh.