Right, but I still need to somehow be able to free up the space that the Catalina and Mojave partitions are taking up. That's why I am waiting more instructions before I d/l Catalina. I guess he didn't look at my profile regarding which version of Sierra I have, so at least that part should be simpler. I think I also told JoeMike I don't need to transfer Sierra to my internal drive since I have it on my external drive and also my older Mac.
If I didn't tell him, that, I should have. Even when I have put older versions I thought I would like to keep on my external drive, I rarely, if ever, used them.
I think "going for broke" is your best approach at this point. If it works, you're home free, and if it fails, you can still fall back on joemike's instructions.
